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
tirmidhi:233 – Bundār Muḥammad b. Bashhār > Muḥammad b. Abū ʿAdī > Ismāʿīl b. Muslim > al-Ḥasan > Samurah b. Jundab

"Messenger of Allah ordered us that when we were three, then one of us should stand forward."  

الترمذي:٢٣٣ – حَدَّثَنَا بُنْدَارٌ مُحَمَّدُ بْنُ بَشَّارٍ حَدَّثَنَا مُحَمَّدُ بْنُ أَبِي عَدِيٍّ قَالَ أَنْبَأَنَا إِسْمَاعِيلُ بْنُ مُسْلِمٍ عَنِ الْحَسَنِ عَنْ سَمُرَةَ بْنِ جُنْدَبٍ قَالَ

أَمَرَنَا رَسُولُ اللَّهِ ﷺ إِذَا كُنَّا ثَلاَثَةً أَنْ يَتَقَدَّمَنَا أَحَدُنَا  

قَالَ أَبُو عِيسَى وَفِي الْبَابِ عَنِ ابْنِ مَسْعُودٍ وَجَابِرٍ وَأَنَسِ بْنِ مَالِكٍ قَالَ أَبُو عِيسَى وَحَدِيثُ سَمُرَةَ حَدِيثٌ حَسَنٌ غَرِيبٌ وَالْعَمَلُ عَلَى هَذَا عِنْدَ أَهْلِ الْعِلْمِ قَالُوا إِذَا كَانُوا ثَلاَثَةً قَامَ رَجُلاَنِ خَلْفَ الإِمَامِ وَرُوِيَ عَنِ ابْنِ مَسْعُودٍ أَنَّهُ صَلَّى بِعَلْقَمَةَ وَالأَسْوَدِ فَأَقَامَ أَحَدَهُمَا عَنْ يَمِينِهِ وَالآخَرَ عَنْ يَسَارِهِ وَرَوَاهُ عَنِ النَّبِيِّ ﷺ وَقَدْ تَكَلَّمَ بَعْضُ النَّاسِ فِي إِسْمَاعِيلَ بْنِ مُسْلِمٍ الْمَكِّيِّ مِنْ قِبَلِ حِفْظِهِ

See similar narrations below:

Collected by Ṭabarānī
tabarani:6951 – Aḥmad b. ʿAlī al-Abbār > ʿAbd al-Raḥman b. Bakr b. al-Rabīʿ b. Muslim > Muḥammad b. Ḥumrān > Ismāʿīl b. Muslim > al-Ḥasan > Samurah

[Machine] "The Messenger of Allah ﷺ has commanded us that when we are three, one of us should lead and become the imam, and when we are two, we should stand side by side in a row."  

الطبراني:٦٩٥١ – حَدَّثَنَا أَحْمَدُ بْنُ عَلِيٍّ الْأَبَّارُ ثنا عَبْدُ الرَّحْمَنِ بْنُ بَكْرِ بْنِ الرَّبِيعِ بْنِ مُسْلِمٍ ثنا مُحَمَّدُ بْنُ حُمْرَانَ عَنْ إِسْمَاعِيلَ بْنِ مُسْلِمٍ عَنِ الْحَسَنِ عَنْ سَمُرَةَ قَالَ

«أَمَرَنَا رَسُولُ اللهِ ﷺ إِذَا كُنَّا ثَلَاثَةً أَنْ نُقَدِّمَ أَحَدَنَا فَيَكُونَ إِمَامًا وَإِذَا كُنَّا اثْنَيْنِ صَفَفْنَا صَفًّا»