Quran 24:7 — Light (Al-Noor)

The fifth oath shall be to incur GOD's condemnation upon him, if he was lying.

[24:6] As for those who accuse their own spouses, without any other witnesses, then the testimony may be accepted if he swears by GOD four times that he is telling the truth.

[24:8] She shall be considered innocent if she swears by GOD four times that he is a liar.