Yahya related to me from Malik that Abdullah ibn Abi Habiba said, "I said to a man, when I was young, A man who only says that he must walk to the House of Allah and does not say that he has vowed to walk, does not have to walk. A man said, Shall I give you this small cucumber? and he had a small cucumber in his hand and you will say, I must walk to the house of Allah? I said, Yes and I said it, for at that time I was still immature. Then, when I came of age, some one said to me that I had to fulfill my vow. I went and asked Said ibn al-Musayyab about it, and he said to me, You must walk. So I walked." Malik said, "That is the custom among us."