Sayyidah Maymunah bint Kardam (may Allah be pleased with her) states: I saw the Messenger of Allah (peace and blessings be upon him) in Makkah; he was on his she-camel, and I was with my father. The narrator mentioned the hadith. (She said:) At that place my father said to him (peace and blessings be upon him): I have vowed to slaughter a number of sheep. The narrator says: As far as I know, he said: fifty sheep at the top of Buwanah. He (peace and blessings be upon him) asked: "Is there anything of these idols there?" He said: No. He (peace and blessings be upon him) said: "Fulfil for Allah what you vowed to Him." My father gathered the sheep and began slaughtering them, and one sheep escaped. He went after it, saying: 'Allahumma awfi 'anni nadhri' (O Allah, fulfil my vow on my behalf), until he caught it and then slaughtered it.
(b) In the narration of Abu Dawud (may Allah have mercy on him), (my father) said: I vowed that if a male child were born to me, I would sacrifice a number of sheep at the top of Buwanah, at one of the mountain passes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20140