[Machine] We used to talk during prayer, greeting each other and indicating our needs. One day, I came to the Prophet ﷺ while he was praying, so I greeted him but he did not respond to me. He gestured to me what had happened and what was said. When he finished, he said, "Indeed, Allah speaks of His affairs as He wills, and He has informed me that you should not speak during prayer."
كُنَّا نَتَكَلَّمُ فِي الصَّلَاةِ يُسَلِّمُ بَعْضُنَا عَلَى بَعْضٍ وَيُومِئُ أَحَدُنَا بِالْحَاجَةِ فَجِئْتُ ذَاتَ يَوْمٍ وَالنَّبِيُّ ﷺ يُصَلِّي فَسَلَّمْتُ عَلَيْهِ فَلَمْ يَرُدَّ عَلَيَّ فَأَخَذَنِي مَا قَدُمَ وَمَا حَدُثَ فَلَمَّا فَرَغَ قَالَ «إِنَّ اللهَ ﷻ يُحْدِثُ مِنْ أَمْرِهِ مَا شَاءَ وَإِنَّهُ قَدْ أَحْدَثَ أَنْ لَا تَتَكَلَّمُوا فِي الصَّلَاةِ»