Leviticus 7:16
But if the sacrifice of his offering be a vow, or a voluntary offering, it shall be eaten the same day that he offers his sacrifice: and on the morrow also the remainder of it shall be eaten:
Torrey's Topical Textbook—AKJV

Leviticus 22:18,22
Speak to Aaron, and to his sons, and to all the children of Israel, and say to them, Whatever he be of the house of Israel, or of the strangers in Israel, that will offer his oblation for all his vows, and for all his freewill offerings, which they will offer to the LORD for a burnt offering;
Torrey's Topical Textbook—AKJV

Numbers 15:3
And will make an offering by fire to the LORD, a burnt offering, or a sacrifice in performing a vow, or in a freewill offering, or in your solemn feasts, to make a sweet smell to the LORD, of the herd or of the flock:
Torrey's Topical Textbook—AKJV