Bilāl ibn Rabāḥ, may Allāh be pleased with him, was one of the seven who were the first to openly proclaim their Islām. He underwent severe torture for the sake of Islām but would not give his tormentors what they wanted. The Prophet ﷺ once mentioned that he had heard the rustling of Bilāl in Jannah.
Bilāl participated in Badr, Uḥud, and all of the campaigns with the Prophet ﷺ. He was the first to give the ādhān for the Messenger of Allāh ﷺ, and was in charge of the Baiṭ al-Māl (State treasury). The following āyah was revealed concerning him and Khabbāb, Ṣuhaib, cĀmmār, etc.: “Do not drive away those who call on their Lord morning and evening seeking His countenance.”He had a sister, Ghufairah, may Allāh be pleased with both of them, but left no progeny.
Note: The commonly heard tale that Bilāl, may Allāh be pleased with him, could not pronounce the shīn in the ādhān is not something to be repeated. (See: Kashf al-Khīfā. Maktabah cIlm al-Ḥadīth. 1:260-261, #695 & 1:530, #1520; al-Maqāṣid al-Ḥasanah. Dār al-Kutub al-cIlmiyyah. P: 112, #221& P: 247, #582) Please consult your local culama who are versed in the science of ḥadīth.