It was narrated that 'Abdullah (رضي الله عنه) said:

The first ones to show Islam openly were seven: the Messenger of Allah , Abu Bakr, ‘Ammar and his mother Sumayyah, Suhaib, Bilal and al-Miqdad. As for the Messenger of Allah (ﷺ), Allah protected him by means of his paternal uncle Abu Talib. As for Abu Bakr, Allah protected him by means of his people. As for the rest of them, the mushrikoon took them and clothed them in shirts of iron, and they exposed them to the heat of the sun, and there was not one of them but he did what they wanted him to do, except Bilal, for he did not care what was done to him for the sake of Allah and his people did not care what happened to him. They handed him over to the children who paraded him around the streets of Makkah as he was saying. One, One.