It was narrated that Ibn Mas'ood said:

A group of Quraish passed by the Messenger of Allah (ﷺ) when Khabbab, Suhaib, Bilal and ‘Ammar were with him, and they said: O Muhammad, are you content with these? Then Qur'an was revealed concerning them: "And warn therewith (the Qur’ān) those who fear that they will be gathered before their Lord, -up to - but Allah knows best the Zalimoon (polytheists and wrong-doers.).” [al-An’am 6:51-58]