John Calvin on Numbers 15:20-21

20. Ye shall offer up a cake. Here another kind of first-fruits is required, to offer up sacred cakes of the first of their dough. First-fruits were offered of their fruits and ears of corn; but the representation was more lively in the bread itself; and, consequently, God would have them present tokens of their gratitude, not only from the barn, but from the mill, and the oven, so that whilst they eat their bread also, they might have Him before their eyes.

Exodus 22

Exodus 22:29

29. Thou shalt not delay to offer the first of thy ripe-fruits, and of thy liquors.

29. Plenitudinem tuam et lachrymam tuam non differes.