كتاب الصلاة
4  
Prayer
(29b)
Chapter: The manner in which one who is led in prayer by an Imam must follow him, and the rule applying to the one who is preceded by him - Section 2
(28)
باب ما على المأموم من المتابعة وحكم المسبوق - الفصل الثاني
Mishkat al-Masabih 1142
‘Ali and Mu'adh b. Jabal reported God’s Messenger as saying, “When any of you comes to pray and the imam is at a certain point, he must do as the imam does.” Tirmidhi transmitted it and said this is a gharib tradition.
عَنْ عَلِيٍّ وَمُعَاذِ بْنِ جَبَلٍ رَضِيَ اللَّهُ عَنْهُمَا قَالَا: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِذَا أَتَى أَحَدُكُمْ الصَّلَاةَ وَالْإِمَامُ عَلَى حَالٍ فَلْيَصْنَعْ كَمَا يَصْنَعُ الْإِمَامُ» . رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ غَرِيبٌ
  صَحِيح   (الألباني) حكم   :
Reference : Mishkat al-Masabih 1142
In-book reference : Book 4, Hadith 559