Maliks Muwatta Book 22, Hadith Number 4.

Section : Making Vows to Walk to the House and Not Succeeding.

Yahya related to me from Malik that Urwa ibn Udhayna al-Laythi said, “I went out with my grandmother who had vowed to walk to the House of Allah. When we had gone part of the way, she could not go on. I sent one of her mawlas to question Abdullah ibn Umar and I went with him. He asked Abdullah ibn Umar, and Abdullah ibn Umar said to him, ‘Take her and let her ride, and when she has the strength let her ride back, and start to walk from the place from which she was unable to go on.'”

Yahya said that he had heard Malik say, “I think that she must sacrifice an animal.”

Yahya related to me from Malik that he had heard that Said ibn al-Musayyab and Abu Salama ibn Abd ar-Rahman said the same as Abdullah ibn Umar.