The mawla of a people is one of them

Rifa'a ibn Rafi' reported that the Prophet ﷺ said to 'Umar, "Gather your people [the Muhajirun] for me." He did so. When they reached the door of the Prophet ﷺ 'Umar came to him and said, "I have gathered my people for you." The Ansar heard that and said, "Revelation has been revealed about Quraysh." People came to see and hear what would be said to them [the Muhajirun]. The Prophet ﷺ came out and stood in the midst of them. He said, "Are there those among you who are not of you?" They replied, "Yes, there are those among us with whom we have made treaties as well as our nephews and our mawlas." The Prophet said, "Our ally is one of us. Our nephew is one of us. Our mawla is one of us." You who are listening:
our friends among you are those who have taqwa of Allah. If you are one of them, then that is good. If that is not the case, then look out. People will bring their actions on the Day of Rising and you will come with burdens and you will be shunned." Then he called out, "O people!" He raised his hands and put them on the heads of Quraysh. "O people! Quraysh are the people of trustworthiness. If anyone who oppresses them (and one of the transmitters thought that he said, 'faults them'), Allah will overturn him." He repeated that three times.

حَدَّثَنَا عَمْرُو بْنُ خَالِدٍ، قَالَ: حَدَّثَنَا زُهَيْرٌ، قَالَ: حَدَّثَنَا عَبْدُ اللهِ بْنُ عُثْمَانَ قَالَ: أَخْبَرَنِي إِسْمَاعِيلُ بْنُ عُبَيْدٍ، عَنْ أَبِيهِ عُبَيْدٍ، عَنْ رِفَاعَةَ بْنِ رَافِعٍ، أَنَّ النَّبِيَّ ﷺ قَالَ لِعُمَرَ رَضِيَ اللَّهُ عَنْهُ: اجْمَعْ لِي قَوْمَكَ، فَجَمَعَهُمْ، فَلَمَّا حَضَرُوا بَابَ النَّبِيِّ ﷺ دَخَلَ عَلَيْهِ عُمَرُ فَقَالَ: قَدْ جَمَعْتُ لَكَ قَوْمِي، فَسَمِعَ ذَلِكَ الأَنْصَارُ فَقَالُوا: قَدْ نَزَلَ فِي قُرَيْشٍ الْوَحْيُ، فَجَاءَ الْمُسْتَمِعُ وَالنَّاظِرُ مَا يُقَالُ لَهُمْ، فَخَرَجَ النَّبِيُّ ﷺ، فَقَامَ بَيْنَ أَظْهُرِهِمْ فَقَالَ: هَلْ فِيكُمْ مِنْ غَيْرِكُمْ؟ قَالُوا: نَعَمْ، فِينَا حَلِيفُنَا وَابْنُ أُخْتِنَا وَمَوَالِينَا، قَالَ النَّبِيُّ ﷺ: حَلِيفُنَا مِنَّا، وَابْنُ أُخْتِنَا مِنَّا، وَمَوَالِينَا مِنَّا، وَأَنْتُمْ تَسْمَعُونَ: إِنَّ أَوْلِيَائِي مِنْكُمُ الْمُتَّقُونَ، فَإِنْ كُنْتُمْ أُولَئِكَ فَذَاكَ، وَإِلاَّ فَانْظُرُوا، لاَ يَأْتِي النَّاسُ بِالأَعْمَالِ يَوْمَ الْقِيَامَةِ، وَتَأْتُونَ بِالأَثْقَالِ، فَيُعْرَضَ عَنْكُمْ، ثُمَّ نَادَى فَقَالَ: يَا أَيُّهَا النَّاسُ، وَرَفَعَ يَدَيْهِ يَضَعَهُمَا عَلَى رُءُوسِ قُرَيْشٍ، أَيُّهَا النَّاسُ، إِنَّ قُرَيْشًا أَهْلُ أَمَانَةٍ، مَنْ بَغَى بِهِمْ، قَالَ زُهَيْرٌ: أَظُنُّهُ قَالَ: الْعَوَاثِرَ، كَبَّهُ اللَّهُ لِمِنْخِرَيْهِ، يَقُولُ ذَلِكَ ثَلاَثَ مَرَّاتٍ.