"Al-'Ajam (non-Arabs) were mentioned before the Messenger of Allah ﷺ so the Prophet ﷺ said: 'I am supported more by them, or, by some of them, than I am by you, or some of you.'"  

سَمِعْتُ أَبَا هُرَيْرَةَ يَقُولُ ذُكِرَتِ الأَعَاجِمُ عِنْدَ النَّبِيِّ ﷺ فَقَالَ النَّبِيُّ ﷺ لأَنَا بِهِمْ أَوْ بِبَعْضِهِمْ أَوْثَقُ مِنِّي بِكُمْ أَوْ بِبَعْضِكُمْ هَذَا حَدِيثٌ غَرِيبٌ لاَ نَعْرِفُهُ إِلاَّ مِنْ حَدِيثِ أَبِي بَكْرِ بْنِ عَيَّاشٍ وَصَالِحُ بْنُ أَبِي صَالِحٍ هَذَا يُقَالُ لَهُ صَالِحُ بْنُ مِهْرَانَ مَوْلَى عَمْرِو بْنِ حُرَيْثٍ  

"We were with the Messenger of Allah ﷺ when Surat Al-Jumu'ah was revealed, so he recited it until he reached: 'And others among them who have not yet joined them (62:3).' A man said to him: 'O Messenger of Allah! Who are these people who have not yet joined us?' But he did not say anything to him." He said: "Salman Al-Farisi was among us." He said: "So the Messenger of Allah ﷺ placed his hand upon Salman and said: 'By the One Whose Hand is my soul! If faith were on Pleiades then men among these people would reach it.'"  

كُنَّا عِنْدَ رَسُولِ اللَّهِ ﷺ حِينَ أُنْزِلَتْ سُورَةُ الْجُمُعَةِ فَتَلاَهَا فَلَمَّا بَلَغَ ( وآخَرِينَ مِنْهُمْ لَمَّا يَلْحَقُوا بِهِمْ ) قَالَ لَهُ رَجُلٌ يَا رَسُولَ اللَّهِ مَنْ هَؤُلاَءِ الَّذِينَ لَمْ يَلْحَقُوا بِنَا فَلَمْ يُكَلِّمْهُ قَالَ وَسَلْمَانُ الْفَارِسِيُّ فِينَا قَالَ فَوَضَعَ رَسُولُ اللَّهِ ﷺ يَدَهُ عَلَى سَلْمَانَ فَقَالَ وَالَّذِي نَفْسِي بِيَدِهِ لَوْ كَانَ الإِيمَانُ بِالثُّرَيَّا لَتَنَاوَلَهُ رِجَالٌ مِنْ هَؤُلاَءِ هَذَا حَدِيثٌ حَسَنٌ وَقَدْ رُوِيَ مِنْ غَيْرِ وَجْهٍ عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ ﷺ وَأَبُو الْغَيْثِ اسْمُهُ سَالِمٌ مَوْلَى عَبْدِ اللَّهِ بْنِ مُطِيعٍ مَدَنِيٌّ