Genesis 26:1, 12-13

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

And Isaac sowed in that land and reaped in the same year a hundredfold. The LORD blessed him, and the man became rich, and gained more and more until he became very wealthy.