أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا سُفْيَانُ، قَالَ حَدَّثَنَا أَبُو حَازِمٍ، قَالَ سَمِعْتُ سَهْلَ بْنَ سَعْدٍ السَّاعِدِيَّ، يَقُولُ وَقَعَ بَيْنَ حَيَّيْنِ مِنَ الأَنْصَارِ كَلاَمٌ حَتَّى تَرَامَوْا بِالْحِجَارَةِ فَذَهَبَ النَّبِيُّ صلى الله عليه وسلم لِيُصْلِحَ بَيْنَهُمْ فَحَضَرَتِ الصَّلاَةُ فَأَذَّنَ بِلاَلٌ وَانْتُظِرَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَاحْتُبِسَ فَأَقَامَ الصَّلاَةَ وَتَقَدَّمَ أَبُو بَكْرٍ رضى الله عنه فَجَاءَ النَّبِيُّ صلى الله عليه وسلم وَأَبُو بَكْرٍ يُصَلِّي بِالنَّاسِ فَلَمَّا رَآهُ النَّاسُ صَفَّحُوا - وَكَانَ أَبُو بَكْرٍ لاَ يَلْتَفِتُ فِي الصَّلاَةِ - فَلَمَّا سَمِعَ تَصْفِيحَهُمُ الْتَفَتَ فَإِذَا هُوَ بِرَسُولِ اللَّهِ صلى الله عليه وسلم أَرَادَ أَنْ يَتَأَخَّرَ فَأَشَارَ إِلَيْهِ أَنِ اثْبُتْ فَرَفَعَ أَبُو بَكْرٍ رضى الله عنه يَعْنِي يَدَيْهِ ثُمَّ نَكَصَ الْقَهْقَرَى وَتَقَدَّمَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَصَلَّى فَلَمَّا قَضَى رَسُولُ اللَّهِ صلى الله عليه وسلم الصَّلاَةَ قَالَ ‏"‏ مَا مَنَعَكَ أَنْ تَثْبُتَ ‏"‏ ‏.‏ قَالَ مَا كَانَ اللَّهُ لِيَرَى ابْنَ أَبِي قُحَافَةَ بَيْنَ يَدَىْ نَبِيِّهِ ‏.‏ ثُمَّ أَقْبَلَ عَلَى النَّاسِ فَقَالَ ‏"‏ مَا لَكُمْ إِذَا نَابَكُمْ شَىْءٌ فِي صَلاَتِكُمْ صَفَّحْتُمْ إِنَّ ذَلِكَ لِلنِّسَاءِ مَنْ نَابَهُ شَىْءٌ فِي صَلاَتِهِ فَلْيَقُلْ سُبْحَانَ اللَّهِ ‏"‏ ‏.‏

Sahl bin Sa'd Al-Sa'idi said: "Words were exchanged between two clans of the Ansar, to the point that they began to throw rocks at one another. The Prophet [SAW] went to reconcile between them. The time for prayer came, so Bilal called Adhan and waited for the Messenger of Allah [SAW], but he was delayed. He said the Iqamah and Abu Bakr, may Allah be pleased with him, went forward (to lead the prayer). Then the Prophet [SAW] came while Abu Bakr was leading the people in prayer, and when the people saw him they clapped. Abu Bakr would not turn around when he was praying, but when he heard them clapping, he turned around and saw the Messenger of Allah [SAW]. He wanted to step back but (the Prophet [SAW]) gestured to him to stay where he was. Abu Bakr, may Allah be pleased with him, raised his hands, then he moved backward and the Messenger of Allah [SAW] came forward and led (the rest of) the prayer. When the Messenger of Allah [SAW] finished praying, he said: 'What prevented you from staying where you were?' He said: 'I would not like Allah to see the son of Abu Quhafah standing in front of His Prophet.' Then he (the Prophet [SAW]) turned to the people and said: 'If you noticed something while you were praying, why did you clap? That is for women. Whoever notices something while he is praying, let him say: "Subhan Allah." Translation Not Available

Book reference: Sunan An Nisai Book 49 Hadith 5413
Web reference: Sunan An Nisai Volume 6 Book 49 Hadith 5415