Genesis 26:1, 12-13

There was a famine in the land, besides the first famine that was in the days of Abraham. And Isaac went to Abimelech king of the Philistines, in Gerar.

Then Isaac sowed in that land, and reaped in the same year a hundredfold; and the LORD blessed him. The man began to prosper, and continued prospering until he became very prosperous