A man exiting the prayer behind the Imam and going to pray by himself in a corner of the Masjid

It was narrated that Jabir said:

"A man from the Ansar came when the Iqamah for prayer had
been said. He entered the Masjid and prayed behind Muadh, and he(Muadh) made the prayer lengthy. The man went away and prayed in a comer of the Masjid, then he left. When Muadh finished praying, it was said to him that so-and-so had done such and such. Muadh said:
'Tomorrow I will mention that to the Messenger of Allah ﷺ.' So Muadh came to the Messenger of Allah ﷺ and told him about that. The Messenger of Allah ﷺ sent for him and asked him: 'What made you do what you did? He said: '0 Messenger of Allah ﷺ, I had been working with my camel to bring water all day, and when I came the Iqamah for prayer had already been said, so I entered the Masjid and joined him in the prayer, then he recited such and such a Surah and made it lengthy, so
I went away and prayed in a comer of the Masjid.' The Messenger of Allah ﷺ said: 'Do you want to cause hardship to the people, 0 Muadh do you want to cause hardship to the
people, 0 Muadh do you want to cause hardship to the people, 0 Muadh?"'

أَخْبَرَنَا وَاصِلُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا ابْنُ فُضَيْلٍ، عَنِ الأَعْمَشِ، عَنْ مُحَارِبِ بْنِ دِثَارٍ، وَأَبِي، صَالِحٍ عَنْ جَابِرٍ، قَالَ جَاءَ رَجُلٌ مِنَ الأَنْصَارِ وَقَدْ أُقِيمَتِ الصَّلاَةُ فَدَخَلَ الْمَسْجِدَ فَصَلَّى خَلْفَ مُعَاذٍ فَطَوَّلَ بِهِمْ فَانْصَرَفَ الرَّجُلُ فَصَلَّى فِي نَاحِيَةِ الْمَسْجِدِ ثُمَّ انْطَلَقَ فَلَمَّا قَضَى مُعَاذٌ الصَّلاَةَ قِيلَ لَهُ إِنَّ فُلاَنًا فَعَلَ كَذَا وَكَذَا . فَقَالَ مُعَاذٌ لَئِنْ أَصْبَحْتُ لأَذْكُرَنَّ ذَلِكَ لِرَسُولِ اللَّهِ ﷺ . فَأَتَى مُعَاذٌ النَّبِيَّ ﷺ فَذَكَرَ ذَلِكَ لَهُ فَأَرْسَلَ رَسُولُ اللَّهِ ﷺ إِلَيْهِ فَقَالَ " مَا حَمَلَكَ عَلَى الَّذِي صَنَعْتَ " . فَقَالَ يَا رَسُولَ اللَّهِ عَمِلْتُ عَلَى نَاضِحِي مِنَ النَّهَارِ فَجِئْتُ وَقَدْ أُقِيمَتِ الصَّلاَةُ فَدَخَلْتُ الْمَسْجِدَ فَدَخَلْتُ مَعَهُ فِي الصَّلاَةِ فَقَرَأَ سُورَةَ كَذَا وَكَذَا فَطَوَّلَ فَانْصَرَفْتُ فَصَلَّيْتُ فِي نَاحِيَةِ الْمَسْجِدِ . فَقَالَ رَسُولُ اللَّهِ ﷺ " أَفَتَّانٌ يَا مُعَاذُ أَفَتَّانٌ يَا مُعَاذُ أَفَتَّانٌ يَا مُعَاذُ " .