Yahya bin Aadm bin Sulaiman يحيى بن آدم بن سليمان · The Book of Oaths and Vows

"I heard my father Ka'b bin Malik narrate: 'I said: O Messenger of Allah, Allah, the Mighty and Sublime, has saved me by my being truthful, and as part of my repentance I want to give my wealth in charity to Allah and His Messenger. He said: Keep some of your wealth for yourself; that is better for you. I said: I will keep my share that is in Khaibar.'"

"The Messenger of Allah came to a man who was being supported by two others and said: 'What is the matter with him?' It was said: 'He vowed to walk to the Ka'bah.' He said: 'Allah does not benefit from his torturing himself.' And he told him to ride."