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:1980a –

“When the Imam says the Salam, then respond to him.” (Using translation from Ibn Mājah 921)   

السيوطي:١٩٨٠a –

" إِذا سَلَّمَ الإِمامُ فَرُدُّوا عَلَيهِ" .  

[هـ] ابن ماجة [طب] الطبرانى في الكبير [عد] ابن عدى في الكامل عن سَمُرةَ بن جندب

See similar narrations below:

Collected by Ibn Mājah, Ṭabarānī
ibnmajah:921 – Hishām b. ʿAmmār > Ismāʿīl b. ʿAyyāsh > Abū Bakr al-Hudhalī > Qatādah > al-Ḥasan > Samurah b. Jundub

“When the Imam says the Salam, then respond to him.”  

ابن ماجة:٩٢١ – حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ حَدَّثَنَا إِسْمَاعِيلُ بْنُ عَيَّاشٍ حَدَّثَنَا أَبُو بَكْرٍ الْهُذَلِيُّ عَنْ قَتَادَةَ عَنِ الْحَسَنِ عَنْ سَمُرَةَ بْنِ جُنْدُبٍ

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا سَلَّمَ الإِمَامُ فَرُدُّوا عَلَيْهِ  

tabarani:6890 – Ibrāhīm b. Muḥammad b. ʿIrq al-Ḥimṣī > Muḥammad b. Muṣaffá > al-Walīd b. Muslim > Saʿīd b. Bashīr > Qatādah > al-Ḥasan > Samurah

[Machine] "The Messenger of Allah ﷺ commanded us to respond when the Imam says the salutation (saying of peace)."  

الطبراني:٦٨٩٠ – حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُحَمَّدِ بْنِ عِرْقٍ الْحِمْصِيُّ ثنا مُحَمَّدُ بْنُ مُصَفًّى ثنا الْوَلِيدُ بْنُ مُسْلِمٍ عَنْ سَعِيدِ بْنِ بَشِيرٍ عَنْ قَتَادَةَ عَنِ الْحَسَنِ عَنْ سَمُرَةَ قَالَ

«أَمَرَنَا رَسُولُ اللهِ ﷺ إِذَا سَلَّمَ الْإِمَامُ أَنْ نَرُدَّ عَلَيْهِ»  

tabarani:6899 – [Chain 1] Aḥmad b. ʿAbd al-Wahhāb b. Najdah al-Ḥawṭī from my father [Chain 2] al-Ḥusayn b. Isḥāq al-Tustarī > Hishām b. ʿAmmār > Ismāʿīl b. ʿAyyāsh > Abū Bakr al-Hudhalī > Qatādah > al-Ḥasan > Samurah

[Machine] The Prophet Muhammad ﷺ said, "When the imam (leader in prayer) says the salaam (concluding prayer), you should say salaam back to him."  

الطبراني:٦٨٩٩ – حَدَّثَنَا أَحْمَدُ بْنُ عَبْدِ الْوَهَّابِ بْنِ نَجْدَةَ الْحَوْطِيُّ ثنا أَبِي ح وَحَدَّثَنَا الْحُسَيْنُ بْنُ إِسْحَاقَ التُّسْتَرِيُّ ثنا هِشَامُ بْنُ عَمَّارٍ قَالَا ثنا إِسْمَاعِيلُ بْنُ عَيَّاشٍ عَنْ أَبِي بَكْرٍ الْهُذَلِيِّ عَنْ قَتَادَةَ عَنِ الْحَسَنِ عَنْ سَمُرَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «إِذَا سَلَّمَ الْإِمَامُ فَرُدُّوا عَلَيْهِ»