A person praying alone behind the row

Anas said:

"The Messenger of Allah (ﷺ) came to our house and I prayed with an orphan of ours behind him, and Umm Sulaim prayed behind us."

أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ، قَالَ حَدَّثَنَا سُفْيَانُ، قَالَ حَدَّثَنِي إِسْحَاقُ بْنُ عَبْدِ اللَّهِ، قَالَ سَمِعْتُ أَنَسًا، - رضى الله عنه - قَالَ أَتَانَا رَسُولُ اللَّهِ صلى الله عليه وسلم فِي بَيْتِنَا فَصَلَّيْتُ أَنَا وَيَتِيمٌ لَنَا خَلْفَهُ وَصَلَّتْ أُمُّ سُلَيْمٍ خَلْفَنَا ‏.‏

It was narrated that Ibn Abbas said:

"There was a woman who used to pray behind the Messenger of Allah (ﷺ) who was beautiful, one of the most beautiful of people. Some of the people used to go to the front row to avoid seeing her, and some used to go to the back row so that when they bowed they could see her from beneath their armpits. Then Allah revealed the words: 'To Us are known those of you who hasten forward and those who lag behind."

أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا نُوحٌ، - يَعْنِي ابْنَ قَيْسٍ - عَنِ ابْنِ مَالِكٍ، - وَهُوَ عَمْرٌو - عَنْ أَبِي الْجَوْزَاءِ، عَنِ ابْنِ عَبَّاسٍ، قَالَ كَانَتِ امْرَأَةٌ تُصَلِّي خَلْفَ رَسُولِ اللَّهِ صلى الله عليه وسلم حَسْنَاءُ مِنْ أَحْسَنِ النَّاسِ - قَالَ - فَكَانَ بَعْضُ الْقَوْمِ يَتَقَدَّمُ فِي الصَّفِّ الأَوَّلِ لِئَلاَّ يَرَاهَا وَيَسْتَأْخِرُ بَعْضُهُمْ حَتَّى يَكُونَ فِي الصَّفِّ الْمُؤَخَّرِ فَإِذَا رَكَعَ نَظَرَ مِنْ تَحْتِ إِبْطِهِ فَأَنْزَلَ اللَّهُ عَزَّ وَجَلَّ ‏{‏ وَلَقَدْ عَلِمْنَا الْمُسْتَقْدِمِينَ مِنْكُمْ وَلَقَدْ عَلِمْنَا الْمُسْتَأْخِرِينَ ‏}‏ ‏.‏