Deuteronomy 14:27,28

The Levite thou shalt not forsake him Thou shalt give him a share in such tithes, or in the product of them. At the end of three years That is, in the third year, as it is expressed Deuteronomy 26:12. The same year This is added to show that he speaks of the third year, and not of the fourth, as some might conjecture from the preceding phrase, at the end of three years.