It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that a man came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah, my sister has vowed to perform Hajj on foot. He (peace and blessings be upon him) said: "Let her ride, for Allah, the Mighty and Majestic, has no need of her walking."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11899