Deuteronomy 26:2-4

2you shall take some of the first of all the fruit of the ground, which you harvest from your land that the Lord your God is giving you, and you shall put it in a basket, and you shall go to the place that the Lord your God will choose, to make his name to dwell there.

3And you shall go to the priest who is in office at that time and say to him, 'I declare today to the Lord your God that I have come into the land that the Lord swore to our fathers to give us.'

4Then the priest shall take the basket from your hand and set it down before the altar of the Lord your God.