Well, there is one text in the vinaya I can think of that suggests stream-enterers have realized the deathless:
Then Ven. Assaji gave this Dhamma exposition to Sariputta the Wanderer:
Whatever phenomena arise from cause:
their cause
& their cessation.
Such is the teaching of the Tathagata,
the Great Contemplative.
Then to Sariputta the wanderer, as he heard this Dhamma exposition, there arose the dustless, stainless Dhamma eye: “Whatever is subject to origination is all subject to cessation.”
Even if just this is the Dhamma,
you have penetrated
to the Sorrowless (asoka) State
unseen, overlooked (by us)
for many myriads of aeons.
Then Sariputta the wanderer went to Moggallana the wanderer. Moggallana the wanderer saw him coming from afar and, on seeing him, said, “Bright are your faculties, my friend; pure your complexion, and clear. Could it be that you have attained the Deathless?”
"Yes, my friend, I have attained the Deathless. " - Upatissa-pasine
The dhamma-eye is generally agreed upon to stand for stream-entry and we have Sariputta attaining the deathless. However, this text seems late to me due to the following verse:
Even if just this is the Dhamma,
you have penetrated
to the Sorrowless (asoka) State
unseen, overlooked (by us)
for many myriads of aeons.
The mention of myriads of aeons feels late to me and is made stranger by the fact that in the beginning of this text it is mentioned that Sariputta was a student of Sanjaya the skeptic whose position on rebirth goes like this:
‘If you ask me if there exists another world [after death], if I thought that there exists another world, would I declare that to you? I don’t think so. I don’t think in that way. I don’t think otherwise. I don’t think not. I don’t think not not. If you asked me if there isn’t another world… both is and isn’t… neither is nor isn’t… if there are beings who transmigrate… if there aren’t… both are and aren’t… neither are nor aren’t… if the Tathagata exists after death… doesn’t… both… neither exists nor exists after death, would I declare that to you? I don’t think so. I don’t think in that way. I don’t think otherwise. I don’t think not. I don’t think not not.’[3] - Sanjaya Belatthiputta
So it seems odd that Sariputta would be referring to aeons when he comes from a skeptical background. Of course, I suppose those who think that stream-entry comes with knowledge of rebirth might state that at the moment of the arising of the dhamma-eye Sariputta also realized that he had been wandering on from birth to birth since beginningless time.