'Sinning' in the Bible

These words of Ish-bosheth really angered Abner and he said, "Am I the head of a dog that belongs to Judah? This very day I am demonstrating loyalty to the house of Saul your father and to his relatives and his friends! I have not betrayed you into the hand of David. Yet you have accused me of sinning with this woman today!

I was blameless before him; I kept myself from sinning.