Numbers 15:17-21

Then the Lord spoke to Moses, saying,

“Speak to the sons of Israel and say to them, ‘When you enter the land where I am bringing you,

then it shall be, that when you eat from the food of the land, you shall lift up an offering to the Lord.

Of the first of your dough you shall lift up a loaf as an offering; as an offering of the threshing floor, so you shall lift it up.

From the first of your dough you shall give to the Lord an offering throughout your generations.