Deuteronomy 14:28
At the end of every three years you shall bring forth all the tithe of your increase in the same year, and shall lay it up within your gates:
Deuteronomy 14:22
You shall surely tithe all the increase of your seed, that which comes forth from the field year by year.
Amos 4:4
"Go to Bethel, and sin; to Gilgal, and sin more. Bring your sacrifices every morning, your tithes every three days,
Deuteronomy 26:12-15
When you have made an end of tithing all the tithe of your increase in the third year, which is the year of tithing, then you shall give it to the Levite, to the foreigner, to the fatherless, and to the widow, that they may eat within your gates, and be filled.