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The Two Tablets Replaced
19“The firstborn from every womb belongs to Me, and all your male livestock, the firstborn from cattle and sheep. 20You shall redeem with a lamb the firstborn from a donkey; and if you do not redeem it, then you shall break its neck. You shall redeem all the firstborn of your sons. None are to appear before Me empty-handed.
21“You shall work six days, but on the seventh day you shall rest; even during plowing time and harvest you shall rest. 22And you shall celebrate the Feast of Weeks, that is, the first fruits of the wheat harvest, and the Feast of Ingathering at the turn of the year. 23Three times a year all your males are to appear before the Lord God, the God of Israel.
Exodus 34:18-23 (NASB)