Leviticus 1:3, 10

If his oblation be a burnt-offering of the herd, he shall offer it a male without blemish: he shall offer it at the door of the tent of meeting, that he may be accepted before Jehovah.

And if his oblation be of the flock, of the sheep, or of the goats, for a burnt-offering; he shall offer it a male without blemish.