Although I remain skeptical about the authenticity of the Apocalypse of Gabriel because we do not know its provenance, and ink on stone for a literary text seems odd, I am very curious about the three day resurrection reference found on the stone.
The stone tablet and its owner, David Jeselsohn
There is a hymn embedded in Hosea (6:1-3) that has relevance to this discussion:
Come, let us return to Yahweh,Originally this priestly (?) poem from 8th c. BCE or earlier, addresses Israel's expectations that the nation has become ill but that God will heal it in as shortest time as possible. It was similar in content with the priestly psalms in which the wounded are raised up from their sickbeds (cf. Ps. 41:3, 10) and statements that God wounds and heals, kills and enlivens (Deut. 23:39; Ezek. 30:21; Job 5:18). In this old context, it had nothing to do with resurrection from the dead.
for he has torn, and he will heal us;
he has stricken, and he will bind us up,
will preserve our life.
After two days, on the third day
he will raise us up, that we may
live in his presence.
Let us know, yes, let us strive,
to know Yahweh.
As the dawn (breaks, so) certain is
his going forth.
He comes to us as surely as the rain,
as the spring rain that waters the land.
However, once resurrection doctrines came into existence in the Maccabean period, could Hosea 6:1-3 have been read as a post-mortem expectation, that the dead would be raised by God on the third day after their deaths? Could the Christians have understood or framed Jesus' resurrection along these expectations?
The earliest blatant reference to this is made by Tertullian (Against Marcion 4.43.1ff.; An Answer to the Jews 13.23). There is an old scholarly article written on the scriptural basis for the three day expectation in the Journal of Biblical Literature 48 (1929) pp. 124-137, by S.V. McCarland, "The Scripture Basis of 'On the Third Day.'"
So it is quite possible, that in Judaism at the time of Jesus there was an expectation that after death, God would resurrect those who died "on the third day" after they had died, using Hosea 6:1-3 as the proof-text. I can imagine the first Christian Jews relying on this expectation as they told stories about Jesus' resurrection. This expectation happened to get connected with Messianic beliefs through association with the Jesus stories.
But what the Apocalypse of Gabriel suggests, if it is authentic and should be read in the way that Knobl insists, is that in Judaism there was also the expectation that the MESSIAH would die and be raised on the third day. Again, I am very hesitant about this since so much of the early Christian literature is open apology for the Messiah's death (and suffering and resurrection) which Jews apparently did not expect. I'm not sure how to reconcile this with the Apocalypse of Gabriel.