Sunan Abi Dawud 564
Narrated AbuHurayrah:
The Prophet (ﷺ) said: whoever performs ablution, and  performs his ablution perfectly, and then goes to the mosque and finds that the people had finished the prayer (in congregation), Allah will give him a reward like one who prayed in congregation and attended it; The reward of those who prayed in congregation will not be curtailed.
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، حَدَّثَنَا عَبْدُ الْعَزِيزِ، - يَعْنِي ابْنَ مُحَمَّدٍ - عَنْ مُحَمَّدٍ، - يَعْنِي ابْنَ طَحْلاَءَ - عَنْ مُحْصِنِ بْنِ عَلِيٍّ، عَنْ عَوْفِ بْنِ الْحَارِثِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ مَنْ تَوَضَّأَ فَأَحْسَنَ وُضُوءَهُ ثُمَّ رَاحَ فَوَجَدَ النَّاسَ قَدْ صَلَّوْا أَعْطَاهُ اللَّهُ جَلَّ وَعَزَّ مِثْلَ أَجْرِ مَنْ صَلاَّهَا وَحَضَرَهَا لاَ يَنْقُصُ ذَلِكَ مِنْ أَجْرِهِمْ شَيْئًا ‏"‏ ‏.‏