أَخْبَرَنَا هَنَّادُ بْنُ السَّرِيِّ، عَنِ ابْنِ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم سَقَطَ مِنْ فَرَسٍ عَلَى شِقِّهِ الأَيْمَنِ فَدَخَلُوا عَلَيْهِ يَعُودُونَهُ فَحَضَرَتِ الصَّلاَةُ فَلَمَّا قَضَى الصَّلاَةَ قَالَ ‏"‏ إِنَّمَا جُعِلَ الإِمَامُ لِيُؤْتَمَّ بِهِ فَإِذَا رَكَعَ فَارْكَعُوا وَإِذَا رَفَعَ فَارْفَعُوا وَإِذَا قَالَ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ فَقُولُوا رَبَّنَا وَلَكَ الْحَمْدُ ‏"‏ ‏.‏
Translation
It was narrated from Anas that

The Prophet (ﷺ) fell from a horse onto his right side, and they entered upon him to visit him. The time for prayer came, and when he had finished praying he said: "The Imam is appointed to be followed, so when he bows, then bow, and when he stands up, then stand up, and when he says: 'Sami' Allahu liman hamidah (Allah hears the one who praises Him)' then say: 'Rabbana wa lakal-hamd (Our Lord, and to You be the praise).'"

Comment

The Book of The At-Tatbiq (Clasping One's Hands Together)

Sunan an-Nasa'i - Hadith Reference: Sunan an-Nasa'i 1061

Hadith Text

The Prophet (ﷺ) fell from a horse onto his right side, and they entered upon him to visit him. The time for prayer came, and when he had finished praying he said: "The Imam is appointed to be followed, so when he bows, then bow, and when he stands up, then stand up, and when he says: 'Sami' Allahu liman hamidah (Allah hears the one who praises Him)' then say: 'Rabbana wa lakal-hamd (Our Lord, and to You be the praise).'"

Scholarly Commentary

This noble hadith establishes fundamental principles of congregational prayer. The Prophet's instruction while injured demonstrates that following the Imam takes precedence over personal conditions, provided one can perform prayer.

The phrase "The Imam is appointed to be followed" establishes the theological basis for congregational prayer leadership. The Imam represents the community before Allah and guides them through prayer movements.

The specific timing instructions - bowing when he bows, standing when he stands - prevent anticipation of movements, which would nullify following. This preserves the unity of congregation.

The response "Rabbana wa lakal-hamd" after the Imam's "Sami' Allahu liman hamidah" shows the complementary nature of leadership and congregation. The Imam affirms Allah's acceptance of praise, while the congregation affirms that all praise belongs to Allah alone.

This hadith also demonstrates the Prophet's commitment to teaching even in difficult circumstances, emphasizing the importance of proper prayer observance above personal comfort.

Juridical Rulings

Following the Imam is obligatory (wajib) and anticipating his movements invalidates the prayer.

The congregation's response must immediately follow the Imam's takbir, maintaining prayer flow.

This ruling applies to all obligatory prayers performed in congregation.