Exodus 22:29-30

22:29 “Do not hold back offerings from your granaries or your vats. ¹  You must give me the firstborn of your sons. 22:30 You must also do this for your oxen and for your sheep; seven days they may remain with their mothers, but give them to me on the eighth day.

[22:29]  ¹ tn The expressions are unusual. U. Cassuto renders them: “from the fullness of your harvest and from the outflow of your presses” (Exodus, 294). He adds the Hittite parallel material to show that the people were to bring the offerings on time and not let them overlap, because the firstfruits had to be eaten first by the priest.