Numbers 15:20-22

²⁰Of the first of your food you shall set apart a cake for a separation; as the separation of the threshing-floor, so shall you set it apart;

²¹Of the first of your bread (dough) you shall give the separation before the Lord in your generations.

²²And should you be in ignorance, and not do all these commandments of which the Lord hath spoken with Mosheh,