24:2The adulteress and the adulterer—whip each one of them a hundred lashes, and let no pity towards them overcome you regarding God’s Law, if you believe in God and the Last Day. And let a group of believers witness their punishment.

24:4Those who accuse chaste women, then cannot bring four witnesses, whip them eighty lashes, and do not ever accept their testimony. For these are the immoral.

24:6As for those who accuse their own spouses, but have no witnesses except themselves, the testimony of one of them is equivalent to four testimonies, if he swears by God that he is truthful.

24:13Why did they not bring four witnesses to testify to it? If they fail to bring the witnesses, then in God’s sight, they are liars.