Abu Huraira reported: We were sitting with the Prophet, peace and blessings be upon him, when Surat al-Jumu’ah was revealed. When he recited the verse, “And others who have yet to join them,” (62:3) a man said, “O Messenger of Allah, who are these?” Salman the Persian was among us and the Prophet placed his hand upon him, then he said, “Were faith to be found as far away as the star of Pleiades, men among these would reach it.”
Source: Ṣaḥīḥ Muslim 2546
Grade: Sahih (authentic) according to Muslim
عَنْ أَبِي هُرَيْرَةَ قَالَ كُنَّا جُلُوسًا عِنْدَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذْ نَزَلَتْ عَلَيْهِ سُورَةُ الْجُمُعَةِ فَلَمَّا قَرَأَ وَآخَرِينَ مِنْهُمْ لَمَّا يَلْحَقُوا بِهِمْ قَالَ رَجُلٌ مَنْ هَؤُلَاءِ وَفِينَا سَلْمَانُ الْفَارِسِيُّ فَوَضَعَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَدَهُ عَلَى سَلْمَانَ ثُمَّ قَالَ لَوْ كَانَ الْإِيمَانُ عِنْدَ الثُّرَيَّا لَنَالَهُ رِجَالٌ مِنْ هَؤُلَاءِ
2546 صحيح مسلم كتاب فضائل الصحابة باب فضل فارس