The Book of Mosques and Places of Prayer
5/7. Chapter:
The prohibition of speaking during the prayer, and the abrogation of its former permissibility
Sahih Muslim
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا هُشَيْمٌ، عَنْ إِسْمَاعِيلَ بْنِ أَبِي خَالِدٍ، عَنِ الْحَارِثِ بْنِ شُبَيْلٍ، عَنْ أَبِي عَمْرٍو الشَّيْبَانِيِّ، عَنْ زَيْدِ بْنِ أَرْقَمَ، قَالَ كُنَّا نَتَكَلَّمُ فِي الصَّلاَةِ يُكَلِّمُ الرَّجُلُ صَاحِبَهُ وَهُوَ إِلَى جَنْبِهِ فِي الصَّلاَةِ حَتَّى نَزَلَتْ { وَقُومُوا لِلَّهِ قَانِتِينَ} فَأُمِرْنَا بِالسُّكُوتِ وَنُهِينَا عَنِ الْكَلاَمِ .
Zaid b. Arqam reported: We used to talk while engaged in prayer and a person talked with a companion on his side in prayer till (this verse) was revealed:" And stand before Allah in devout obedience" (ii, 238) and we were commanded to observe silence (in prayer) and were forbidden to speak.
Reference : Sahih Muslim 539aIn-book reference : Book 5, Hadith 43USC-MSA web (English) reference : Book 4, Hadith 1098