Narrated Abdullah ibn Abbas:

AbusSahba' said: We discussed the things that cut off the prayer according to Ibn Abbas. He said: I and a boy from Banu AbdulMuttalib came riding a donkey, and the Messenger of Allah (ﷺ) was leading the people in prayer. He dismounted and I also dismounted. I left the donkey in front of the row (of the worshippers). He (the Prophet) did not pay attention to that. Then two girls from Banu AbdulMuttalib came and joined the row in the middle, but he paid no attention to that.

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ مَنْصُورٍ، عَنِ الْحَكَمِ، عَنْ يَحْيَى بْنِ الْجَزَّارِ، عَنْ أَبِي الصَّهْبَاءِ، قَالَ تَذَاكَرْنَا مَا يَقْطَعُ الصَّلاَةَ عِنْدَ ابْنِ عَبَّاسٍ فَقَالَ جِئْتُ أَنَا وَغُلاَمٌ مِنْ بَنِي عَبْدِ الْمُطَّلِبِ عَلَى حِمَارٍ وَرَسُولُ اللَّهِ صلى الله عليه وسلم يُصَلِّي فَنَزَلَ وَنَزَلْتُ وَتَرَكْنَا الْحِمَارَ أَمَامَ الصَّفِّ فَمَا بَالاَهُ وَجَاءَتْ جَارِيَتَانِ مِنْ بَنِي عَبْدِ الْمُطَّلِبِ فَدَخَلَتَا بَيْنَ الصَّفِّ فَمَا بَالَى ذَلِكَ ‏.‏