2 Samuel 24:10
And David's heart smote him after that he had numbered the people. And David said to the LORD, I have sinned greatly in that I have done: and now, I beseech you, O LORD, take away the iniquity of your servant; for I have done very foolishly.
Torrey's Topical Textbook—AKJV

Psalm 25:11
For your name's sake, O LORD, pardon my iniquity; for it is great.
Torrey's Topical Textbook—AKJV

Psalm 51:1
Have mercy on me, O God, according to your loving kindness: according to the multitude of your tender mercies blot out my transgressions.
Torrey's Topical Textbook—AKJV

Jeremiah 14:7-9,20
O LORD, though our iniquities testify against us, do you it for your name's sake: for our backslidings are many; we have sinned against you.
Torrey's Topical Textbook—AKJV