Musannaf Ibn Abi Shaybah 39346 — The acceptance of Islam by Abu Bakr

Mujahid said: Those who first made their Islam public were seven people: the Messenger of Allah (peace and blessings be upon him), Sayyiduna Abu Bakr, Sayyiduna Bilal, Sayyiduna Khabbab, Sayyiduna Suhayb, Sayyiduna Ammar and the mother of Ammar, Sayyidah Sumayyah (may Allah be pleased with them). As for the Messenger of Allah (peace and blessings be upon him), his uncle became a barrier (against the disbelievers); and as for Sayyiduna Abu Bakr, his people became a barrier (against the disbelievers). The others were seized and made to wear coats of iron mail, and then the disbelievers left them to roast in the sun, until their hardship reached its utmost limit, and they gave them what they demanded. Then the people of each man came to him with leather mats containing water, threw them onto them, and then carried them by their sides, except for Sayyiduna Bilal. When evening came, Abu Jahl came and began to abuse Sayyidah Sumayyah and speak obscenely; then he stabbed her with a spear and killed her. So she is the first martyr to be martyred in Islam. As for Sayyiduna Bilal, his own life became of little worth to him for the sake of Allah, until the polytheists grew weary. They put a rope around his neck, then ordered their children, and they began to drag him between the mountains of Makkah, and Sayyiduna Bilal began to say: Ahad, Ahad (One, One).