Exodus 34:21

¹⁹  All that openeth the matrix is mine; and every firstling among thy cattle, whether ox or sheep, that is male.

²⁰  But the firstling of an ass thou shalt redeem with a lamb: and if thou redeem him not, then shalt thou break his neck. All the firstborn of thy sons thou shalt redeem. And none shall appear before me empty.

²¹  Six days thou shalt work, but on the seventh day thou shalt rest: in earing time and in harvest thou shalt rest.

²²  And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year's end.

²³  Thrice in the year shall all your men children appear before the LORD God, the God of Israel.