Sunan an-Nasa'i 4955
سنن النسائي#4955Hasanأَخْبَرَنَا عَبْدُ الْحَمِيدِ بْنُ مُحَمَّدٍ، قَالَ حَدَّثَنَا مَخْلَدٌ، قَالَ حَدَّثَنَا ابْنُ جُرَيْجٍ، عَنْ عَطَاءٍ، عَنْ أَيْمَنَ، مَوْلَى ابْنِ عُمَرَ عَنْ تُبَيْعٍ، عَنْ كَعْبٍ، قَالَ مَنْ تَوَضَّأَ فَأَحْسَنَ وُضُوءَهُ ثُمَّ شَهِدَ صَلاَةَ الْعَتَمَةِ فِي جَمَاعَةٍ ثُمَّ صَلَّى إِلَيْهَا أَرْبَعًا مِثْلَهَا يَقْرَأُ فِيهَا وَيُتِمُّ رُكُوعَهَا وَسُجُودَهَا كَانَ لَهُ مِنَ الأَجْرِ مِثْلُ لَيْلَةِ الْقَدْرِ .
It was narrated that Ka'b said:"Whoever performs Wudu and performs Wudu well, then attends Isha prayer in congregation, then prays four similar Rakahs after that, reciting therein and bowing and prostrating perfectly, that will bring him a reward like that of (praying) Lailat Al-Qadar." (Hasan Maqtu)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 46:85