Urwah bin Udhaynah said: I set out with my grandmother, who had vowed to perform Hajj on foot. When we had gone some way along the road, she became unable to walk. She sent her slave to Abdullah bin Umar (may Allah be pleased with them both) to ask him, and I went along too. He said: Tell her to ride, and then to walk from the point where she became unable.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20128
Abdullah bin Abbas (may Allah be pleased with them both) narrates the like of what Ibn Umar (may Allah be pleased with them both) said, but Ibn Abbas (may Allah be pleased with them both) said: She should also sacrifice a camel.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20129
Isma'il narrates from Amir al-Sha'bi that he was asked about a man who had vowed to walk to the House of Allah; he walked half the way and then rode. Ibn Abbas (may Allah be pleased with him) said: Next year he should ride as much as he walked, and walk as much as he rode, and sacrifice a camel.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20130
Yahya bin Sa'id (may Allah have mercy on him) states: I was under an obligation to walk, then I was afflicted with a pain in my side, so I rode. When I came to Makkah, I asked Ata bin Abi Rabah (may Allah have mercy on him) and others, and they said: You owe a sacrificial animal. When I came to Madinah and asked them, they said: I should walk again from the place where I had become unable to walk. So I walked again from there.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20131