Hadith 474 a - The Book of Prayers - Sahih Muslim - صحيح مسلم - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

4. The Book of Prayers - كتاب الصلاة

39) Chapter: Following The Imam And Acting After Him

Al-Bara' (b. 'Azib), and he was no liar (but a truthful Companion of the Holy Prophet), reported:

They used to say prayer behind the Messenger of Allah (ﷺ). I never saw anyone bending his back at the time when he (the Holy Prophet) raised his head, till the Messenger of Allah (ﷺ) placed his forehead on the ground. They then fell in prostration after him.

Reference: 474 a
English reference: Book 4, Hadith 958
In-book reference: Book 4, Hadith 224
Grade: Sahih
Read this hadith from Darussalam Collection

39) باب مُتَابَعَةِ الإِمَامِ وَالْعَمَلِ بَعْدَهُ ‏

حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا أَبُو إِسْحَاقَ، ح قَالَ وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا أَبُو خَيْثَمَةَ، عَنْ أَبِي إِسْحَاقَ، عَنْ عَبْدِ اللَّهِ بْنِ يَزِيدَ، قَالَ حَدَّثَنِي الْبَرَاءُ، وَهُوَ غَيْرُ كَذُوبٍ أَنَّهُمْ كَانُوا يُصَلُّونَ خَلْفَ رَسُولِ اللَّهِ صلى الله عليه وسلم فَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ لَمْ أَرَ أَحَدًا يَحْنِي ظَهْرَهُ حَتَّى يَضَعَ رَسُولُ اللَّهِ صلى الله عليه وسلم جَبْهَتَهُ عَلَى الأَرْضِ ثُمَّ يَخِرُّ مَنْ وَرَاءَهُ سُجَّدًا ‏.‏