Ikrimah narrates from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the sister of Sayyiduna Uqbah bin Amir (may Allah be pleased with him) vowed to perform Hajj on foot, but she did not have the strength for it. He (peace and blessings be upon him) said: "Allah has no need of your sister walking; let her ride and offer a camel in sacrifice."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20114