Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 268

وَعَنْهُ قَالَ: ذُكِرَتِ الْأَعَاجِمُ عِنْدَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: ” لَأَنَا بِهِمْ أَوْ بِبَعْضِهِمْ أَوْثَقُ مِنِّي بِكُمْ أَوْ بِبَعْضِكُمْ رَوَاهُ التِّرْمِذِيّ

He told that when the foreigners were mentioned in the presence of God’s messenger he said, “I have more trust in them (or, in some of them) than I have in you (or, in some of you.)” Tirmidhi transmitted it.