غُفْرَانَكَ

I ask You (Allāh) for forgiveness.

Reference: Al-Tirmidhī (#7), Abū Dāwud (#30), Ibn Mājah (#300), and al-Nasāʾī in ʿAmal al-Yawm wa al-Laylah (#79). Also see the takhrīj of Zād al-Maʿād (2/386).