Hadith 29:152
Jarir narrated to us, from Mansur, from Mujahid, who said: The first to manifest Islam were seven: The Messenger of Allah (peace be upon him), Abu Bakr, Bilal, Khabbab, Suhayb, Ammar, and Sumayyah, the mother of Ammar. As for the Messenger of Allah (peace be upon him), his uncle protected him. As for Abu Bakr, his people protected him. The others were seized and dressed in iron coats of mail, and they were melted [exposed to the heat] in the sun until the hardship reached its utmost limit for them. So they gave them what they asked for. Then their people came to each man among them with leather mats containing water, and they threw them into them, then they lifted them by their sides—except for Bilal. When evening came, Abu Jahl came and began to insult Sumayyah and speak obscenely, then he stabbed her and killed her; she was the first martyr to be martyred in Islam. As for Bilal, his soul became insignificant to him for the sake of Allah until they grew weary of him. They placed a rope around his neck, then ordered their children to drag him between the two mountains of Makkah, while he kept saying, "One, One [Ahad, Ahad]."
حدثنا جرير عن منصور عن مجاهد قال أول من أظهر الإسلام سبعة رسول الله صلى الله عليه وسلم وأبو بكر وبلال وخباب وصهيب وعمار وسمية أم عمار فأما رسول الله صلى الله عليه وسلم فمنعه عمه وأما أبو بكر فمنعه قومه وأخذ الآخرون فألبسوا أدراع الحديد وصهروهم في الشمس حتى بلغ الجهد منهم كل مبلغ فأعطوهم ما سألوا فجاء إلى كل رجل منهم قومه بأنطاع الأدم فيها الماء فألقوهم فيها ثم حملوا بجوانبه إلا بلالا فلما كان العشي جاء أبو جهل فجعل يشتم سمية ويرفث ثم طعنها فقتلها فهي أول شهيد استشهد في الإسلام إلا بلالا فإنه هانت عليه نفسه في الله حتى ملوه فجعلوا في عنقه حبلا ثم أمروا صبيانهم فيشتدوا به بين أخشبي مكة وجعل يقول أحد أحد