Exodus 34:20
But the firstborn of an ass thou shalt ransom with a lamb, and if thou ransom him not, then shalt thou cut off his head. All the firstborn of thy sons thou shalt ransom, and none shall appear before me empty.
Exodus 23:15
Thou shalt keep the feast of unleavened bread (thou shalt eat unleavened bread seven days as I commanded thee, in the time appointed of the month Abib, for in it thou didst come out from Egypt; and none shall appear before me empty),
Deuteronomy 16:16
Three times each year shall all thy males appear before the LORD thy God in the place which he shall choose: in the solemn feast of unleavened bread and in the solemn feast of weeks and in the solemn feast of the tabernacles. And they shall not appear before the LORD empty,
Exodus 13:15
and it came to pass when Pharaoh was hardening himself to not let us go that the LORD slew all the firstborn in the land of Egypt from the human firstborn to the firstborn of the beast; therefore, I sacrifice to the LORD every male that opens the womb, and I ransom every firstborn of my sons.
Exodus 13:13
And every firstborn of an ass thou shalt ransom with a lamb; and if thou wilt not ransom it, then thou shalt cut off its head; and in the same manner thou shalt ransom all the human firstborn among thy sons.
Numbers 18:15
Every thing that opens the womb in all flesh, which they shall offer unto the LORD, whether it is of men or animals, shall be thine; nevertheless the firstborn of man shalt thou surely ransom, and the firstborn of unclean animals shalt thou ransom.
Exodus 13:10
Thou shalt, 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 sons of Israel and the animals of the Levites instead of their animals, and the Levites shall be mine; I am the LORD.
1 Samuel 9:7-8
Then Saul replied unto his servant, But, behold, if we go, what shall we bring the man? For the bread is spent in our vessels, and we have nothing to present unto the man of God. What do we have?
2 Samuel 24:24
And the king said unto Araunah, No, but I will surely buy it of thee at a price, for I will not offer burnt offerings unto the LORD my God of that which costs me nothing. So David bought the threshingfloor and the oxen for fifty shekels of silver.