The Book of Vows (Kitab Al-Nadhr)
Muslim :: Book 14 : Hadith 4032
'Uqba b. Amir reported: My sister took a vow that she would walk bare foot to the house of Allah (Ka'ba). She asked me to inquire from Allah's Messenger (may peace be upon him) about it. I sought his decision and he said: She should walk on foot and ride also.
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