Does God forgive serious sins like murder or adultery?

Yes — and the biblical record makes this unmistakably clear through some of the most striking examples of forgiveness in all of Scripture.

David committed both adultery and murder. He arranged the death of Uriah the Hittite to cover up his adultery with Bathsheba (2 Samuel 11). When Nathan the prophet confronted him, David's repentance was genuine and total: "I have sinned against the Lord." (2 Samuel 12:13). The consequence came — the child born of that union died, and David's house was troubled for the rest of his life. But God's forgiveness was real. Psalm 51 — the most searching prayer of repentance in the Bible — came out of that experience, and God called David "a man after my own heart" (Acts 13:22).

The Apostle Paul was a murderer. He stood holding the coats of those who stoned Stephen (Acts 7:58). He dragged Christian men and women to prison and, by his own testimony, cast his vote against them when they were put to death (Acts 26:10). And yet he writes in 1 Timothy 1:15-16: "Christ Jesus came into the world to save sinners, of whom I am the foremost. But I received mercy for this reason, that in me, as the foremost, Jesus Christ might display his perfect patience as an example to those who were to believe in him for eternal life."

The foremost sinner. Saved. Put on display as an example.

The woman caught in adultery in John 8 was brought before Jesus by men ready to stone her. His response: "Neither do I condemn you; go, and from now on sin no more." Forgiveness and a call to holiness, in one breath.

Isaiah 1:18 is God's direct offer: "Though your sins are like scarlet, they shall be as white as snow; though they are red like crimson, they shall become like wool."

The forgiveness of God is not calibrated to the size of the sin. It is grounded in the sufficiency of the cross. What Jesus did on Calvary was sufficient for every sin ever committed by every person who ever lived. The only question is whether you come to Him for it.