[Machine] We used to converse during prayer and greet each other, and one of us would nod indicating a need. So, one day I came while the Prophet ﷺ was praying and I greeted him, but he did not respond. He grabbed me by my clothes and informed me of what had happened and what was said. When he finished, he said, "Indeed, Allah ﷻ speaks of His affairs as He pleases, and He has informed us that we should not talk during prayer."
كُنَّا نَتَكَلَّمُ فِي الصَّلَاةِ وَيُسَلِّمُ بَعْضُنَا عَلَى بَعْضٍ وَيُومِئُ أَحَدُنَا بِالْحَاجَةِ قَالَ فَجِئْتُ ذَاتَ يَوْمٍ وَالنَّبِيُّ ﷺ يُصَلِّي فَسَلَّمْتُ عَلَيْهِ فَلَمْ يَرُدَّ فَأَخَذَنِي مَا قَدُمَ وَمَا حَدُثَ فَلَمَّا فَرَغَ قَالَ إِنَّ اللهَ ﷻ يُحْدِثُ مِنْ أَمْرِهِ مَا يَشَاءُ وَإِنَّهُ قَدْ أَحْدَثَ أَنْ لَا تَكَلَّمُوا فِي الصَّلَاةِ