Musannaf Ibn Abi Shayba 19:696

Abu Bakr narrated to us, he said: Abbad bin al-Awwam narrated to us, from Muhammad bin Amr, from Abu Salamah, from Abu Hurairah, who said: Ma'iz bin Malik came to the Prophet, peace and blessings of Allah be upon him, and said: "I have committed adultery." He turned away from him until he came to him four times. Then he ordered that he be stoned. When the stones struck him, he turned and ran. A man met him with a camel's jawbone in his hand, and he struck him and brought him down. This was mentioned to the Prophet, peace and blessings of Allah be upon him—his fleeing when the stones touched him—and he said: "Why did you not leave him?"