If I sin, then thou markest me, And thou wilt not acquit me from mine iniquity.

If I sinned, You would take note, and would not acquit me of my iniquity.

If I sinned, then Thou hast observed me, And from mine iniquity dost not acquit me,

If I sinned, thou wouldest mark me, and thou wouldest not acquit me of mine iniquity.