[Machine] The people of Quraysh passed by the Prophet Muhammad ﷺ , and with him were Khubbab, Suhaib, Bilal, and Ammar. They said, "O Muhammad, are you pleased with these (companions)?" So the Qur'an was revealed about them from the verse "And warn with it those who fear that they will be gathered to their Lord" (Quran 6:51) until the verse "And Allah is most knowing of the wrongdoers" (Quran 6:58).  

مَرَّ الْمَلَأُ مِنْ قُرَيْشٍ عَلَى رَسُولِ اللهِ ﷺ وَعِنْدَهُ خَبَّابٌ وَصُهَيْبٌ وَبِلَالٌ وَعَمَّارٌ فَقَالُوا يَا مُحَمَّدُ أَرَضِيتَ بِهَؤُلَاءِ؟ فَنَزَلَ فِيهِمُ الْقُرْآنُ {وَأَنْذِرْ بِهِ الَّذِينَ يَخَافُونَ أَنْ يُحْشَرُوا إِلَى رَبِّهِمْ} [الأنعام 51] إِلَى قَوْلِهِ {وَاللهُ أَعْلَمُ بِالظَّالِمِينَ} [الأنعام 58]