The 74th mitzvah is that we are commanded that a man who is a zav1 must bring an offering after being healed from his discharge.
This offering, known as a korban zav, consists of two doves or two young pigeons, one for a sin-offering and one as a burnt-offering. His atonement is incomplete2 until they are sacrificed.
The source of this commandment is G‑d's statement3 (exalted be He), "When the man is rid of his discharge...on the eighth day he shall take for himself two doves..."
