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 the livestock—of the herd and of the flock.

3‘If his offering is a burnt sacrifice of the herd, let him offer a male without blemish; he shall offer it of his own free will at the door of the tabernacle of meeting before the Lord.