[Machine] He saw a man who did not complete his bowing and prostration, so he approached him and took him by the hand and said, "Do not imitate him, nor anyone like him. There is no prayer except with the mother of the book. If you are behind an Imam, recite silently to yourself, and if you are alone, then listen to your own ears. Do not harm those who are to your right or left." He is Muslim ibn Abdullah al-Akki al-Shami, and the opinion of Ubayy ibn Ka'b in this matter is well-known.  

أَنَّهُ رَأَى رَجُلًا لَا يُتِمُّ رُكُوعَهُ وَلَا سُجُودَهُ فَأَتَاهُ فَأَخَذَ بِيَدِهِ فَقَالَ لَا تَشَبَّهُوا بِهَذَا وَلَا بِأَمْثَالِهِ إِنَّهُ لَا صَلَاةَ إِلَّا بِأُمِّ الْكِتَابِ فَإِنْ كُنْتَ خَلْفَ إِمَامٍ فَاقْرَأْ فِي نَفْسِكَ وَإِنْ كُنْتَ وَحْدَكَ فَأَسْمِعْ أُذُنَيْكَ وَلَا تُؤْذِ مَنْ عَنْ يَمِينِكَ وَمَنْ عَنْ يَسَارِكَ هُوَ مُسْلِمُ بْنُ عَبْدِ اللهِ الْعَكِّيُّ الشَّامِيُّ وَمَذْهَبُ عُبَادَةَ فِي ذَلِكَ مَشْهُورٌ وَمِنْهُمْ أُبَيُّ بْنُ كَعْبٍ ؓ