What was the first real prophecy given in the Old Testament?

Les teaches that the first real prophecy given in the Old Testament was when God told Abraham that the children of Israel would end up in a land that wasn't theirs and would be in slavery. He was speaking of Egypt, and that afterward they would come out and return to the land of Canaan. This was a distinctive prophecy of what would happen years down the road, but God put it in a time frame of 430 years. Les then points to Daniel chapter 9, where Daniel writes that 490 years are determined upon Israel, prophecy leading up to the crucifixion and giving the idea of the seven years of tribulation. That prophecy concerned Israel, and nothing in the Old Testament, prophetic or otherwise, connects it to the Church, which is His Body. In Psalms chapter 2, Les sees a brief outline of the Old Testament prophetic program given to the Jew, including the raging Gentiles, the Jews imagining a vain thing, and the kings and rulers of Israel conspiring together, though the Romans carried out the crucifixion while the Jews demanded it.