I used to pray the ʿIsha prayer with the Prophet ﷺ and then go to lead my people in the prayer.  

أَنَّ مُعَاذَ بْنَ جَبَلٍ كَانَ يُصَلِّي مَعَ النَّبِيِّ ﷺ ثُمَّ يَرْجِعُ فَيَؤُمُّ قَوْمَهُ  

Jabir bin ʿAbdullah said, "Muʿadh bin Jabal used to pray with the Prophet ﷺ and then go to lead his people in prayer Once he led the ʿIsha' prayer and recited Surat "Al-Baqara." Somebody left the prayer and Muʿadh criticized him. The news reached the Prophet ﷺ and he said to Muʿadh, 'You are putting the people to trial,' and repeated it thrice (or said something similar) and ordered him to recite two medium Suras of Mufassal." (ʿAmr said that he had forgotten the names of those Suras).  

كَانَ مُعَاذُ بْنُ جَبَلٍ يُصَلِّي مَعَ النَّبِيِّ ﷺ ثُمَّ يَرْجِعُ فَيَؤُمُّ قَوْمَهُ فَصَلَّى الْعِشَاءَ فَقَرَأَ بِالْبَقَرَةِ فَانْصَرَفَ الرَّجُلُ فَكَأَنَّ مُعَاذًا تَنَاوَلَ مِنْهُ فَبَلَغَ النَّبِيَّ ﷺ فَقَالَ فَتَّانٌ فَتَّانٌ فَتَّانٌ ثَلاَثَ مِرَارٍ أَوْ قَالَ فَاتِنًا فَاتِنًا فَاتِنٌ وَأَمَرَهُ بِسُورَتَيْنِ مِنْ أَوْسَطِ الْمُفَصَّلِ قَالَ عَمْرٌو لاَ أَحْفَظُهُمَا