'Fault' in the Bible

Then was Abner very wroth for the words of Ishbosheth, and said, Am I a dog's head, which against Judah do shew kindness this day unto the house of Saul thy father, to his brethren, and to his friends, and have not delivered thee into the hand of David, that thou chargest me to day with a fault concerning this woman?

Absalom said to Joab, "Look, I sent a message to you saying, 'Come here so that I can send you to the king with this message: "Why have I come from Geshur? It would be better for me if I were still there."' Let me now see the face of the king. If I am at fault, let him put me to death!"