Sunan an-Nasa'i, Volume 5, Book 41, Hadith 4232 (DarusSalam) ⓘ
Yahya bin Zurarah As-Sahmi said: "My father narrated to me from his grandfather, Al-Harith bin 'Amr that he met the Messenger of Allah during the Farewell Pilgrimage and said: 'May my father and mother be sacrificed for you! O Messenger of Allah; pray for forgiveness for me.' He said: 'May Allah forgive you (plural).' He was atop his slit-eared camel and I came around to the other side"' and he quoted the Hadith.
أَخْبَرَنِي هَارُونُ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا عَفَّانُ، قَالَ حَدَّثَنَا يَحْيَى بْنُ زُرَارَةَ السَّهْمِيُّ، قَالَ حَدَّثَنِي أَبِي، عَنْ جَدِّهِ الْحَارِثِ بْنِ عَمْرٍو، ح وَأَنْبَأَنَا هَارُونُ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا هِشَامُ بْنُ عَبْدِ الْمَلِكِ، قَالَ حَدَّثَنِي يَحْيَى بْنُ زُرَارَةَ السَّهْمِيُّ، قَالَ حَدَّثَنِي أَبِي، عَنْ جَدِّهِ الْحَارِثِ بْنِ عَمْرٍو، أَنَّهُ لَقِيَ رَسُولَ اللَّهِ صلى الله عليه وسلم فِي حَجَّةِ الْوَدَاعِ فَقُلْتُ بِأَبِي أَنْتَ يَا رَسُولَ اللَّهِ وَأُمِّي اسْتَغْفِرْ لِي . فَقَالَ " غَفَرَ اللَّهُ لَكُمْ " . وَهُوَ عَلَى نَاقَتِهِ الْعَضْبَاءِ ثُمَّ اسْتَدَرْتُ مِنَ الشِّقِّ الآخَرِ وَسَاقَ الْحَدِيثَ .
also referenced under: Hadith 4227 (Reference) & Book 41, Hadith 6 (In-Book)