Ikrimah narrates from Sayyiduna Uqbah bin Amir al-Juhani (may Allah be pleased with him) that he said to the Prophet (peace and blessings be upon him): My sister has vowed to perform Hajj on foot. He (peace and blessings be upon him) said: "What does Allah care for your sister's walking?"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20119