Deuteronomy 14:28
At the end of three years you shall bring forth all the tithe of your increase the same year, and shall lay it up within your gates:
Deuteronomy 14:22
You shall truly tithe all the increase of your seed, that the field brings forth year by year.
Amos 4:4
Come to Bethel, and transgress; at Gilgal multiply transgression; and bring your sacrifices every morning, and your tithes after three years:
Deuteronomy 26:12-15
When you have finished tithing all the tithes of your increase the third year, which is the year of tithing, and have given it unto the Levite, the stranger, the fatherless, and the widow, that they may eat within your gates, and be filled;