What did God promise Abraham about the nation Israel would serve and their exit from it?

Les explains from these verses that God told Abraham the nation they would serve, Egypt, would be judged, and afterward the children of Israel would come out with great substance. Abraham was also told he would die after a good old age, and that in the fourth generation they would come back to Canaan. Les notes they would end up in a land that was not theirs, known as Egypt, go under slavery and bondage, but God would bring them back to the promised land. He ties the delay to the Amorites having four hundred years of opportunity to either clean up their act or become so bad that God would be fair in telling the Israelites to annihilate them.