[Machine] When people used to enter the mosque and find others praying, the person who entered would ask someone next to him to inform him about what he missed, so he could make up for it. Then, he would stand up and pray with them until one day Mu'adh came, and they signaled to him saying, "You have missed such and such." Mu'adh refused to pray until he performed the prayer he had missed, and then he prayed after that. He mentioned this to the Messenger of Allah ﷺ , and he said, "Mu'adh has done well, and you should do the same."  

كَانَ النَّاسُ إِذَا دَخَلَ الرَّجُلُ الْمَسْجِدَ فَوَجَدَهُمْ يُصَلُّونَ سَأَلَ الَّذِي إِلَى جَنْبِهِ فَيُخْبِرُهُ بِمَا فَاتَهُ لِيَقْضِيَ ثُمَّ يَقُومُ فَيُصَلِّي مَعَهُمْ حَتَّى أَتَى مُعَاذٌ يَوْمًا فَأَشَارُوا إِلَيْهِ إِنَّكَ قَدْ فَاتَكَ كَذَا وَكَذَا فَأَبَى أَنْ يُصَلِّيَ فَصَلَّى ثُمَّ صَلَّى بَعْدَ مَا فَاتَهُ فَذَكَرَ ذَلِكَ لِرَسُولِ اللهِ ﷺ فَقَالَ «أَحْسَنَ مُعَاذٌ وَأَنْتُمْ فَافْعَلُوا كَمَا فَعَلَ»