Sunan An-Nasa'i

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