Leviticus 22:23

22:23 As for an ox or a sheep with a limb too long or stunted, you may present it as a freewill offering, but it will not be acceptable for a votive offering.

Leviticus 22:29

22:29 When you sacrifice a thanksgiving offering to the Lord, you must sacrifice it so that it is acceptable for your benefit.

Deuteronomy 12:6

12:6 And there you must take your burnt offerings, your sacrifices, your tithes, the personal offerings you have prepared, your votive offerings, your freewill offerings, and the firstborn of your herds and flocks.

Ezekiel 46:12

46:12 When the prince provides a freewill offering, a burnt offering, or peace offerings as a voluntary offering to the Lord, the gate facing east will be opened for him, and he will provide his burnt offering and his peace offerings just as he did on the Sabbath. Then he will go out, and the gate will be closed after he goes out.