Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:1029a –
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السيوطي:١٠٢٩a –

"إذا أحدث الإمام في آخر صلاتِه حين يستوى قاعدًا، فقد تمت صلاتهُ وصلاةُ من وراءَه على مثلِ صَلاتِه".  

[عب] عبد الرازق وابن جريرِ، [طب] الطبرانى في الكبير عن ابن عمرو، وفيه عبد الرحمن بن زياد ضعيف

See similar narrations below:

Collected by Ṭabarānī
tabarani:13784 – Isḥāq b. Ibrāhīm al-Dabarī > ʿAbd al-Rāzzaq > al-Thawrī > ʿAbd al-Raḥman b. Ziyād b. Anʿam > Bakr b. Sawādah > ʿAbd al-Raḥman b. Rāfiʿ > ʿAbdullāh b. ʿAmr

[Machine] The Messenger of Allah ﷺ said, "If the Imam begins a new action before completing his prayer until he sits down, then his prayer is completed, and the prayer of those behind him is also completed in the same manner as his prayer."  

الطبراني:١٣٧٨٤ – حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الدَّبَرِيُّ عَنْ عَبْدِ الرَّازَّقِ عَنِ الثَّوْرِيِّ عَنْ عَبْدِ الرَّحْمَنِ بْنِ زِيَادِ بْنِ أَنْعَمَ عَنْ بَكْرِ بْنِ سَوَادَةَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ رَافِعٍ عَنْ عَبْدِ اللهِ بْنِ عَمْرٍو قَالَ

قَالَ رَسُولُ اللهِ ﷺ «إِذَا أَحْدَثَ الْإِمَامُ فِي آخِرِ صَلَاتِهِ حَتَّى يَسْتَوِيَ قَاعِدًا فَقَدْ تَمَّتْ صَلَاتُهُ وَصَلَاةُ مَنْ وَرَاءَهُ عَلَى مِثْلِ صَلَاتِهِ»