What is the beginning of genuine prophecy according to Les?
The beginning of genuine prophecy is God telling Abraham future events, long into the future, which will come to pass exactly as He declares. It starts with God revealing to Abram what will happen to his descendants, including their affliction and eventual return.
Les explains that this is probably the beginning of genuine prophecy, where God tells Abraham things that are going to take place long into the future, and they will come true exactly as He says. He then specifies that Abram's seed will be strangers in Egypt, afflicted four hundred years, but God will judge Egypt and bring them out with great substance. Abram will die in peace and be buried in a good old age, and in the fourth generation his descendants will return to Canaan. God waits because the iniquity of the Amorites is not yet complete.
And he said unto Abram, Know of a surety that thy seed shall be a stranger in a land that is not theirs, and shall serve them; and they shall afflict them four hundred years;