Exodus 34:20
The firstborn of a donkey you shall redeem with a lamb: and if you will not redeem it, then you shall break its neck. All the firstborn of your sons you shall redeem. No one shall appear before me empty.
Exodus 23:15
You shall observe the feast of unleavened bread. Seven days you shall eat unleavened bread, as I commanded you, at the time appointed in the month Abib (for in it you came out from Egypt), and no one shall appear before me empty.
Deuteronomy 16:16
Three times in a year shall all your males appear before the LORD your God in the place which he shall choose: in the feast of unleavened bread, and in the feast of weeks, and in the feast of tents; and they shall not appear before the LORD empty:
Exodus 13:15
and it happened, when Pharaoh would hardly let us go, that the LORD killed all the firstborn in the land of Egypt, both the firstborn of man, and the firstborn of animal. Therefore I sacrifice to the LORD all that opens the womb, being males; but all the firstborn of my sons I redeem.'
Exodus 13:13
Every firstborn of a donkey you shall redeem with a lamb; and if you will not redeem it, then you shall break its neck; and you shall redeem all the firstborn of man among your sons.
Numbers 18:15
Everything that opens the womb, of all flesh which they offer to the LORD, both of man and animal shall be yours: nevertheless you shall surely redeem the firstborn of man, and you shall redeem the firstborn of unclean animals.
Exodus 13:10
You shall therefore keep this ordinance in its season from year to year.
Numbers 3:45-51
"Take the Levites instead of all the firstborn among the children of Israel, and the livestock of the Levites instead of their livestock; and the Levites shall be mine. I am the LORD.
1 Samuel 9:7-8
Then Saul said to his servant, "But behold, if we go, what shall we bring the man? For the bread is gone in our vessels, and there is no gift to bring to the man of God. What do we have?"
2 Samuel 24:24
The king said to Araunah, "No; but I will most certainly buy it from you for a price. I will not offer burnt offerings to the LORD my God which cost me nothing." So David bought the threshing floor and the oxen for fifty shekels of silver.