Not graded
Bulugh al-Maram 100
وَعَنْهَا; { أَنَّ اَلنَّبِيَّ - صلى الله عليه وسلم -كَانَ إِذَا خَرَجَ مِنْ اَلْغَائِطِ قَالَ:
"غُفْرَانَكَ"
Narrated ‘Aisha (rad):
When the Prophet (ﷺ) came out of the privy, he used to say, “Ghufranaka (O Allah! Grant me Your forgiveness)”. [Reported by Al-Khamsa, Abu Hatim and Al-Hakim graded it Sahih (sound)].
Cited in Bulugh al-Maram (No. 100).