if one of us prays in his house, then comes to the mosque and finds that the iqamah is being called, and if I pray along with them ( in congregation), I feel something inside about it. Abu Ayyub replied: We asked the Prophet ﷺ about it. He said: That is a share from the spoils received by the warriors (i.e. he will receive double the reward of the prayer). (Using translation from Abū Dāʾūd 578)
يُصَلِّي أَحَدُنَا فِي مَنْزِلِهِ الصَّلَاةَ ثُمَّ يَأْتِي الْمَسْجِدَ وَتُقَامُ الصَّلَاةُ فَأُصَلِّي مَعَهُمْ فَأَجِدُ فِي نَفْسِي مِنْ ذَلِكَ شَيْئًا؟ فَقَالَ أَبُو أَيُّوبَ سَأَلْنَا عَنْ ذَلِكَ النَّبِيَّ ﷺ فَقَالَ ذَلِكَ لَهُ سَهْمُ جَمْعٍ