Exodus 34:20
But the firstling of a donkey you shall redeem with a lamb: and if you redeem it not, then shall you break its neck. All the firstborn of your sons you shall redeem. And none shall appear before me empty.
Exodus 23:15
You shall keep the feast of unleavened bread: (you shall eat unleavened bread seven days, as I commanded you, in the time appointed of the month Abib; for in it you came out from Egypt: and none 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 tabernacles: and they shall not appear before the LORD empty:
Exodus 13:15
And it came to pass, when Pharaoh refused to let us go, that the LORD slew all the firstborn in the land of Egypt, both the firstborn of man, and the firstborn of beast: therefore I sacrifice to the LORD all that opens the womb, being males; but all the firstborn of my children I redeem.
Exodus 13:13
And every firstling of a donkey you shall redeem with a lamb; and if you will not redeem it, then you shall break its neck: and all the firstborn of man among your children shall you redeem.
Numbers 18:15
Every thing that opens the womb in all flesh, which they bring unto the LORD, whether it be of men or animals, shall be yours: nevertheless the firstborn of man shall you surely redeem, and the firstling of unclean animals shall you redeem.
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 cattle of the Levites instead of their cattle; and the Levites shall be mine: I am the LORD.
1 Samuel 9:7-8
Then said Saul to his servant, But, behold, if we go, what shall we bring the man? for the bread is gone from our sacks, and there is not a present to bring to the man of God: what have we?
2 Samuel 24:24
And the king said unto Araunah, Nay; but I will surely buy it from you at a price: neither will I offer burnt offerings unto the LORD my God of that which does cost me nothing. So David bought the threshing floor and the oxen for fifty shekels of silver.