Deuteronomy 14:22-23

Thou shalt truly tithe all the increase of thy seed, that the field bringeth forth year by year. And thou shalt eat before the LORD thy God, in the place which he shall choose to place his name there, the tithe of thy corn, of thy wine, and of thine oil, and the firstlings of thy herds and of thy flocks; that thou mayest learn to fear the LORD thy God always.