[Machine] Mu'adh used to pray the evening prayer with the Prophet ﷺ , then he would go to his people and pray with them. For him, it was a voluntary prayer, but for them, it was obligatory. (Narrated by Abu Bakr al-Naysaburi, Abdul Rahman ibn Bishr, and Abu al-Azhar, who narrated from Abdul Razzaq, who was informed by Ibn Jurayj, who was informed by Amr ibn Dinar, who mentioned it similarly except that he said, "He would pray with them, and that prayer was voluntary for him, but obligatory for them.")  

أَنَّ مُعَاذًا كَانَ يُصَلِّي مَعَ النَّبِيِّ ﷺ الْعِشَاءَ ثُمَّ يَنْصَرِفُ إِلَى قَوْمِهِ فَيُصَلِّي بِهِمْ هِيَ لَهُ تَطَوُّعٌ وَلَهُمْ فَرِيضَةٌ 5106 قَالَ وَحَدَّثَنَا أَبُو بَكْرٍ النَّيْسَابُورِيُّ ثنا عَبْدُ الرَّحْمَنِ بْنُ بِشْرٍ وَأَبُو الْأَزْهَرِ قَالَا ثنا عَبْدُ الرَّزَّاقِ أنبأ ابْنُ جُرَيْجٍ أَخْبَرَنِي عَمْرُو بْنُ دِينَارٍ فَذَكَرَهُ بِمِثْلِهِ إِلَّا أَنَّهُ قَالَ فَيُصَلِّي بِهِمْ تِلْكَ الصَّلَاةَ هِيَ لَهُ نَافِلَةٌ وَلَهُمْ فَرِيضَةٌ