Exodus 35:29; Leviticus 22:18; Leviticus 22:21; Deuteronomy 12:6

29 fAll the men and women, the people of Israel, whose heart moved them to bring anything for the work that the Lord had commanded by Moses to be done brought it as a freewill offering to the Lord.

18 Speak to Aaron and his sons and all the people of Israel and say to them, vWhen any one of the house of Israel or of the sojourners in Israel presents a burnt offering as his offering, for any of their vows or freewill offerings that they offer to the Lord,

21 And when anyone yoffers a sacrifice of peace offerings to the Lord zto fulfill a vow or as a freewill offering from the herd or from the flock, to be accepted it must be perfect; there shall be no blemish in it.

and there you shall bring your burnt offerings and your sacrifices, kyour tithes and the contribution that you present, your vow offerings, your freewill offerings, and the lfirstborn of your herd and of your flock.