Numbers 15:19-21

19and when you eat of a  the bread of the land, you shall present a contribution to the  Lord. 20 b  Of the first of your dough you shall present a loaf as a contribution; like a c  contribution from the threshing floor, so shall you present it. 21 d  Some of the first of your dough you shall give to the  Lord as a contribution throughout your generations.

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