مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 1150
Prayer
One who prays a prayer twice - Section 1
عَنْ جَابِرٍ قَالَ: كَانَ مُعَاذُ بْنُ جَبَلٍ يُصَلِّي مَعَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ثُمَّ يَأْتِي قومه فَيصَلي بهم
Jabir said that Muadh b. Jabal would pray along with the Prophet, then go to his people and lead them in prayer. (Bukhari and Muslim.)
Mishkat al-Masabih, 1150مُتَّفق عَلَيْهِ (الألباني)