And there was a famine in the land besides the former famine that was in the days of Abraham, and Isaac went to Abimelech king of the Philistines in Gerar. Why mention that this famine is besides the former famine that was in the days of Abraham? Netziv explains that God brought a famine in Abraham’s day to teach the world that the righteous are afforded divine protection. Over time this lesson was forgotten and so God brought a famine in the times of Isaac to remind the world of this lesson…Indeed Isaac sowed in that land and he reaped that year a hundredfold, and the LORD blessed him –even at a time of famine.