Leviticus 1:3
If his offering be a burnt sacrifice of the herd, let him offer a male without blemish: he shall offer it of his own voluntary will at the door of the tabernacle of the congregation before the LORD.
Torrey's Topical Textbook—AKJV

Leviticus 22:18,19
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