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
tabarani:9314 – Isḥāq b. Ibrāhīm > ʿAbd al-Razzāq > Isrāʾīl > Manṣūr > Ibrāhīm > ʿAlqamah > Ibn Masʿūd

[Machine] "When the imam greets you, do not ignore him as his words are important."  

الطبراني:٩٣١٤ – حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ عَنْ عَبْدِ الرَّزَّاقِ عَنْ إِسْرَائِيلَ عَنْ مَنْصُورٍ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنِ ابْنِ مَسْعُودٍ قَالَ

«إِذَا تَعَايَا الْإِمَامُ فَلَا تَرُدَّ عَلَيْهِ فَإِنَّهُ كَلَامٌ»  

See similar narrations below:

Collected by Ibn Mājah
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