Musannaf Ibn Abi Shayba 7:276

Zayd ibn al-Hubab narrated to us, from Musa ibn Ubaydah, who said: I heard al-Qasim, and he was asked about a man who swore to walk to the House (the Kaaba), so he walked but became exhausted and rode. He said: "If he is able to return, he should walk the distance he rode, and ride the distance he walked." He said: And I heard Yazid ibn Abdullah ibn Qusayt saying: "He should ride and offer a sacrificial animal (badana)."