Deuteronomy 26:2

26:2 you must take the first of all the ground’s produce you harvest from the land the Lord your God is giving you, place it in a basket, and go to the place where he chooses to locate his name.

Deuteronomy 26:10

26:10 So now, look! I have brought the first of the ground’s produce that you, Lord, have given me.” Then you must set it down before the Lord your God and worship before him.