there's a description of the 4 stages in the Samanaphula
sutta
Can't find a description there.
Anyway just found a good one, quoted a small excerpt here but
recommend reading the whole page:
http://www.accesstoinsight.org/lib/study/stream2.html#arising
What does the Dhamma eye see when it arises?
Then Ven. Assaji gave this Dhamma exposition to Sariputta the
wanderer:
Then to Sariputta the wanderer, as he heard this exposition of
Dhamma, there arose the dustless, stainless Dhamma eye:
Whatever is subject to origination is all subject to
cessation.
—
Mv 1.23.5
This standard formula — it is repeated throughout the Canon —
may not seem that remarkable an insight. However, the texts make
clear that this insight is not a matter of belief or contemplation,
but of direct seeing. As the following passages show, belief and
contemplation may be conducive to the seeing — and an undefined
level of belief and discernment may actually guarantee that someday
in this lifetime the seeing will occur — but only with the actual
seeing does there come a dramatic shift in the course of one's life
and one's relationship to the Dhamma.
"Monks, the eye is inconstant, changeable, alterable. The ear...
The nose... The tongue... The body... The mind is inconstant,
changeable, alterable.
"Forms... Sounds... Aromas... Flavors... Tactile sensations...
Ideas are inconstant, changeable, alterable.
"Eye-consciousness... Ear-consciousness... Nose-consciousness...
Tongue-consciousness... Body-consciousness...
Intellect-consciousness is inconstant, changeable, alterable.
"Eye-contact... Ear-contact... Nose-contact... Tongue-contact...
Body-contact... Intellect-contact is inconstant, changeable,
alterable.
"Feeling born of eye-contact... Feeling born of ear-contact...
Feeling born of nose-contact... Feeling born of tongue-contact...
Feeling born of body-contact... Feeling born of intellect-contact
is inconstant, changeable, alterable.
"Perception of forms... Perception of sounds... Perception of
smells... Perception of tastes... Perception of tactile
sensations... Perception of ideas is inconstant, changeable,
alterable.
"Intention for forms... Intention for sounds... Intention for
smells... Intention for tastes... Intention for tactile
sensations... Intention for ideas is inconstant, changeable,
alterable.
"Craving for forms... Craving for sounds... Craving for
smells... Craving for tastes... Craving for tactile sensations...
Craving for ideas is inconstant, changeable, alterable.
"The earth property... The liquid property... The fire
property... The wind property... The space property... The
consciousness property is inconstant, changeable, alterable.
"Form... Feeling... Perception... Fabrications... Consciousness
is inconstant, changeable, alterable.
"One who has conviction & belief that these phenomena are
this way is called a faith-follower: one who has entered the
orderliness of rightness, entered the plane of people of integrity,
transcended the plane of the run-of-the-mill. He is incapable of
doing any deed by which he might be reborn in hell, in the animal
womb, or in the realm of hungry shades. He is incapable of passing
away until he has realized the fruit of stream-entry.
"One who, after pondering with a modicum of discernment, has
accepted that these phenomena are this way is called a
Dhamma-follower: one who has entered the orderliness of rightness,
entered the plane of people of integrity, transcended the plane of
the run-of-the-mill. He is incapable of doing any deed by which he
might be reborn in hell, in the animal womb, or in the realm of
hungry shades. He is incapable of passing away until he has
realized the fruit of stream-entry.
"One who knows and sees that these phenomena are this way is
called a stream-winner, steadfast, never again destined for states
of woe, headed for self-awakening."
— SN
25.1-10
To Upali the householder, as he was sitting right there, there
arose the dustless, stainless Dhamma eye: Whatever is subject
to origination is all subject to cessation. Then — having seen
the Dhamma, having reached the Dhamma, known the Dhamma, gained a
footing in the Dhamma, having crossed over & beyond doubt,
having had no more questioning — Upali the householder gained
fearlessness and was independent of others with regard to the
Teacher's message.
— MN 56
Part of what makes the arising of the Dhamma eye such a powerful
experience is that the realization that "Whatever is subject to
origination is all subject to cessation" must follow on a glimpse
of what stands in opposition to "all that is subject to
origination," i.e., a glimpse of the Unconditioned —
deathlessness.
[Immediately after attaining the stream] Sariputta the wanderer
went to Moggallana the wanderer. Moggallana the wanderer saw him
coming from afar and, on seeing him, said, "Your faculties are
bright, my friend; your complexion pure & clear. Could it be
that you have attained the Deathless?"
"Yes, my friend, I have..."
—
Mv 1.23.5
The connection between Ven. Assaji's verse above, discussing
causation, and the arising of the Dhamma eye in Sariputta suggests
that realization conveyed by the Dhamma eye is not just an insight
into the fleeting, impermanent nature of ordinary experience.
Instead, it extends also to a realization of the conditioned,
dependent nature of that experience. Other passages describing in
more detail the knowledge of a stream-winner — one who has entered
the stream — show that this is in fact the case. The Dhamma eye
sees that things arise and pass away in line with a particular type
of causality, in which the effects of causes are felt immediately
or over the course of time.
"And which is the noble method that he has rightly seen &
rightly ferreted out through discernment?
"There is the case where a disciple of the noble ones
notices:
"In other words:
"Now from the remainderless fading & cessation of that very
ignorance comes the cessation of fabrications. From the cessation
of fabrications comes the cessation of consciousness. From the
cessation of consciousness comes the cessation of name-&-form.
From the cessation of name-&-form comes the cessation of the
six sense media. From the cessation of the six sense media comes
the cessation of contact. From the cessation of contact comes the
cessation of feeling. From the cessation of feeling comes the
cessation of craving. From the cessation of craving comes the
cessation of clinging/sustenance. From the cessation of
clinging/sustenance comes the cessation of becoming. From the
cessation of becoming comes the cessation of birth. From the
cessation of birth, then aging & death, sorrow, lamentation,
pain, distress, & despair all cease. Such is the cessation of
this entire mass of stress & suffering.
"This is the noble method that he has rightly seen & rightly
ferreted out through discernment."
—
AN 10.92
"When a disciple of the noble ones has seen well with right
discernment this dependent co-arising & these dependently
co-arisen phenomena as they have come to be, it is not possible
that he would run after the past, thinking, 'Was I in the past? Was
I not in the past? What was I in the past? How was I in the past?
Having been what, what was I in the past?' or that he would run
after the future, thinking, 'Shall I be in the future? Shall I not
be in the future? What shall I be in the future? How shall I be in
the future? Having been what, what shall I be in the future?' or
that he would be inwardly perplexed about the immediate present,
thinking, 'Am I? Am I not? What am I? How am I? Where has this
being come from? Where is it bound?' Such a thing is not possible.
Why is that? Because the disciple of the noble ones has seen well
with right discernment this dependent co-arising & these
dependently co-arisen phenomena as they have come to be."
—
SN 12.20
The insight of a stream-winner into the truths of causality on
the one hand, and of the Deathless on the other, is accurate as far
as it goes, but it does not equal the intensity of the insight of
the arahant — one who has reached the final level of awakening. The
differences between the two are suggested in the following
simile.
"My friend, although I have seen properly with right
discernment, as it actually is present, that 'The cessation of
becoming is Unbinding,' still I am not an arahant whose
fermentations are ended. It's as if there were a well along a road
in a desert, with neither rope nor water bucket. A man would come
along overcome by heat, oppressed by the heat, exhausted,
dehydrated, & thirsty. He would look into the well and would
have knowledge of 'water,' but he would not dwell touching it with
his body. In the same way, although I have seen properly with right
discernment, as it actually is present, that 'The cessation of
becoming is Unbinding,' still I am not an arahant whose
fermentations are ended."
—
SN 12.68