Did the Prophet (may Allah's peace and blessings be upon him) ask forgiveness for you? He said: Yes, and for you, and he then recited this verse: {...ask forgiveness for your sin and for the believing men and believing women...} [Sūrat Muhammad: 19]

عن عبد الله بن سَرْجس، قال: رأيتُ النبي صلى الله عليه وسلم وأكلتُ معه خُبْزا ولحْمًا، أو قال ثَرِيدًا، قال فقلتُ له: أَسْتَغْفَرَ لك النبي صلى الله عليه وسلم ؟ قال: نعم، ولك، ثم تَلا هذه الآية {وَاسْتَغْفِرْ لِذَنْبِكَ وَلِلْمُؤْمِنِينَ وَالْمُؤْمِنَاتِ} [محمد: 19] قال: ثم دُرْتُ خَلْفَه فنَظَرْتُ إلى خاتَم النُّبوة بين كَتِفَيْه، عند ناغِض كَتِفِه اليُسْرى، جُمْعًا، عَلَيْه خِيلانٌ كأمْثال الثَّآلِيلِ.

‘Abdullāh ibn Sarjis reported: I saw the Prophet (may Allah's peace and blessings be upon him) and ate bread and meat with him - or he said Tharīd (bread soaked in soup). I said to him: "Did the Prophet (may Allah's peace and blessings be upon him) ask forgiveness for you?" He said: "Yes, and for you, and he then recited this verse: {...ask forgiveness for your sin and for the believing men and believing women...} [Sūrat Muhammad: 19] I then went behind him and saw the seal of prophet-hood between his shoulders on the top of his left shoulder, like a clenched fist with spots on it, resembling moles.

Source · Narrated by Muslim

From the Hadith Encyclopedia (hadeethenc.com).