Hadith 8:943
Abu Bakr narrated to us, he said: Abd al-A’la narrated to us, from Yunus, from al-Hasan, regarding a man who vowed to perform Hajj walking. He said: He shall walk, and when he becomes exhausted, he shall ride and offer a sacrificial animal (hadi).
حدثنا أبو بكر قال حدثنا عبد الأعلى عن يونس عن الحسن في رجل نذر أن يحج ماشيا قال يمشي حتى إذا أعيا ركب وأهدى