Leviticus 1:2-3

2“Speak to the children of Israel and say to them, ‘When any one of you brings an offering to the Lord, you shall bring your offering of [domestic] animals from the herd (cattle, oxen) or from the flock (sheep, goats).

3If his offering is a burnt offering from the herd, he shall offer a male without blemish; he shall offer it at the doorway of the Tent of Meeting so that he may be accepted before the Lord.