[Machine] I came to the Prophet ﷺ after having prayed with my family, and the call for prayer was made. I sat down, and when he finished praying, he asked me, "Are you a Muslim?" I replied, "Yes." He said, "What prevented you from praying with the people?" I said, "I had already prayed with my family." He said, "Pray with the people, even if you have prayed with your family." This narration was reported by Sufyan from Zaid bin Aslam from Bishr bin Mahjan, but there is doubt regarding it being Busr bin Mahjan. This is how Malik reported it, as well as the companions of Zaid bin Aslam.  

أَتَيْتُ النَّبِيَّ ﷺ وَقَدْ صَلَّيْتُ فِي أَهْلِي فَأُقِيمَتِ الصَّلَاةُ فَجَلَسْتُ فَلَمَّا صَلَّى قَالَ «أَلَسْتَ مُسْلِمًا؟» قُلْتُ نَعَمْ قَالَ «مَا مَنَعَكَ أَنْ تُصَلِّيَ مَعَ النَّاسِ؟» قَالَ كُنْتُ صَلَّيْتُ فِي أَهْلِي قَالَ «فَصَلِّ مَعَ النَّاسِ وَإِنْ كُنْتَ قَدْ صَلَّيْتَ فِي أَهْلِكَ» كَذَا رَوَاهُ سُفْيَانُ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ بِشْرِ بْنِ مِحْجَنٍ وَوَهِمَ فِيهِ إِنَّمَا هُوَ بُسْرُ بْنُ مِحْجَنٍ هَكَذَا رَوَاهُ مَالِكٌ وَأَصْحَابُ زَيْدِ بْنِ أَسْلَمَ