That adultery is sinning against God can be seen from what Joseph told Potiphar’s wife when she tried to seduce him to become party to adultery: “How could I commit this great badness and actually sin against God?” (Gen. 39:9) And what did King David say to Jehovah in expressing repentance for his sin of adultery with Uriah’s wife? “Against you, you alone, I have sinned, and what is bad in your eyes I have done.”​—Ps. 51:4.a