The Annwar said, "O Messenger of Allah ﷺ! Every prophet has his own followers and we have followed you. So will you invoke Allah to let our followers be considered from us (as Ansar too)?" So he invoked Allah accordingly.  

قَالَتِ الأَنْصَارُ يَا رَسُولَ اللَّهِ لِكُلِّ نَبِيٍّ أَتْبَاعٌ وَإِنَّا قَدِ اتَّبَعْنَاكَ فَادْعُ اللَّهَ أَنْ يَجْعَلَ أَتْبَاعَنَا مِنَّا فَدَعَا بِهِ فَنَمَيْتُ ذَلِكَ إِلَى ابْنِ أَبِي لَيْلَى قَالَ قَدْ زَعَمَ ذَلِكَ زَيْدٌ  

(A man from the Ansar) The Ansar said, "Every nation has followers and (O Prophet) we have followed you, so invoke Allah to let our followers be considered from us (as Ansar like ourselves)." So the Prophet ﷺ said, "O Allah! Let their followers be considered as Ansar like themselves."  

قَالَتِ الأَنْصَارُ إِنَّ لِكُلِّ قَوْمٍ أَتْبَاعًا وَإِنَّا قَدِ اتَّبَعْنَاكَ فَادْعُ اللَّهَ أَنْ يَجْعَلَ أَتْبَاعَنَا مِنَّا قَالَ النَّبِيُّ ﷺ اللَّهُمَّ اجْعَلْ أَتْبَاعَهُمْ مِنْهُمْ قَالَ عَمْرٌو فَذَكَرْتُهُ لاِبْنِ أَبِي لَيْلَى قَالَ قَدْ زَعَمَ ذَاكَ زَيْدٌ قَالَ شُعْبَةُ أَظُنُّهُ زَيْدَ بْنَ أَرْقَمَ