Deuteronomy 14:28
At the end of three years thou shalt bring forth all the tithe of thine increase the same year and shalt lay it up within thy gates.
Deuteronomy 14:22
Thou shalt without fail tithe all the increase of thy seed that thy field brings forth each year.
Amos 4:4
Go to Bethel, and transgress; at Gilgal increase the rebellion; and bring your sacrifices early in the morning and your tithes every three years:
Deuteronomy 26:12-15
When thou hast made an end of tithing all the tithes of thy fruits the third year, which is the year of tithing and hast given it unto the Levite, the stranger, the fatherless, and the widow, that they may eat within thy gates and be filled;