It is narrated from Sayyiduna Uqbah bin Amir (may Allah be pleased with him) that he asked the Messenger of Allah (peace and blessings be upon him) about his sister, who had vowed that she would walk on foot to the House of Allah. He (peace and blessings be upon him) said: "Allah Almighty has no need of this vow of your sister; let her ride, and let her sacrifice a camel."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14817