2 Samuel 12:13

12:13 Then David exclaimed to Nathan, “I have sinned against the Lord!” Nathan replied to David, “Yes, and the Lord has forgiven your sin. You are not going to die.

2 Samuel 19:20

19:20 For I, your servant, know that I sinned, and I have come today as the first of all the house of Joseph to come down to meet my lord the king.”

2 Samuel 24:10

24:10 David felt guilty after he had numbered the army. David said to the Lord, “I have sinned greatly by doing this! Now, O Lord, please remove the guilt of your servant, for I have acted very foolishly.”

2 Samuel 24:17

24:17 When he saw the angel who was destroying the people, David said to the Lord, “Look, it is I who have sinned and done this evil thing! As for these sheep – what have they done? Attack me and my family.”