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:1632a –
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السيوطي:١٦٣٢a –

"إِذَا جَلَسَ الإِمامُ في آخرِ ركعةٍ، ثمَّ أحدثَ رجلٌ مِنْ خلفِهِ قبلَ أنْ يُسلمَ الإِمامُ فقد تمت صَلاتُهُ".  

الخطيب عن ابن عمرو

See similar narrations below:

Collected by Suyūṭī
suyuti:2365a –
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السيوطي:٢٣٦٥a –

"إذَا قعدَ الإمامُ في آخِر رَكْعَةٍ مِنْ صلاتِه ثُمَّ أحدثَ قبلَ أنْ يتشهدَ فقد تمت صلاتُه".  

[ق] البيهقى في السنن وضعفه عن ابن عمرو