The Conversion of Ḥamzah:

Ibn Isḥāq relates: A reliable man from the tribe of Aslam told me that Abū Jahl once passed by the Messenger of Allah ﷺ at al-Ṣafā, harassed him, and hurled insults at him, while the Prophet ﷺ said nothing in reply. A slave-woman belonging to ʿAbd Allāh ibn Judʿān overheard the entire incident. Abū Jahl then walked off to the Quraysh council that gathered by the Kaʿbah and sat with them.

Not long afterward Ḥamzah ibn ʿAbd al-Muṭṭalib approached, his bow slung across his shoulder, returning from a hunt—he was fond of hunting—and whenever he came back he would begin with a circumambulation of the Kaʿbah. He was the most honored youth in Quraysh and the one of strongest resolve. As he passed the slave-woman she said, “O Abū ʿUmārah, if only you had seen what your nephew just suffered from Abū al-Ḥakam! He found him sitting here, abused and reviled him, and spoke to him harshly, while Muhammad offered no reply.”

Anger seized Ḥamzah—as Allah willed to honor him—and he strode quickly toward Abū Jahl. Seeing him seated among the people, he went straight up to him; standing over his head, he raised his bow and struck him with it, inflicting a severe wound. Then he declared, “You dare insult him? I am upon his religion and I say what he says—answer me if you can!”

Men of Banū Makhzūm rose to defend Abū Jahl, but Abū Jahl said, “Leave Abū ʿUmārah; by Allah, I did curse his nephew in an ugly manner.” Ḥamzah remained steadfast in his Islam, and after his conversion Quraysh realized that the Messenger of Allah ﷺ now enjoyed strength and protection and that Ḥamzah would shield him, so they eased their hostility somewhat.