Mishkat al-Masabih
Mishkat al-Masabih 1111
Arabic hadith text
عَن سَمُرَة بن جُنْدُب قَالَ: أَمَرَنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا كُنَّا ثَلَاثَةً أَنْ يَتَقَدَّمَنَا أَحَدُنَا. رَوَاهُ التِّرْمِذِيّ
Translation
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Samurah ibn Jundub reported that the Messenger of Allah (ﷺ) instructed us, when we were three, to have one of us stand in front. Al-Tirmidhi transmitted it.
Notes and open questions — unreviewed
The source gives a clear instruction for a group of three.