Sunan Abi Dawud 2498
سنن أبي داود#2498Da'ifحَدَّثَنَا أَحْمَدُ بْنُ عَمْرِو بْنِ السَّرْحِ، حَدَّثَنَا ابْنُ وَهْبٍ، عَنْ يَحْيَى بْنِ أَيُّوبَ، وَسَعِيدِ بْنِ أَبِي أَيُّوبَ، عَنْ زَبَّانَ بْنِ فَائِدٍ، عَنْ سَهْلِ بْنِ مُعَاذٍ، عَنْ أَبِيهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِنَّ الصَّلاَةَ وَالصِّيَامَ وَالذِّكْرَ تُضَاعَفُ عَلَى النَّفَقَةِ فِي سَبِيلِ اللَّهِ بِسَبْعِمِائَةِ ضِعْفٍ " .
Narrated Mu'adh ibn Anas al-Juhani: The Messenger of Allah (ﷺ) said: (The reward of) prayer, fasting and remembrance of Allah is enhanced seven hundred times over (the reward of) spending in Allah's path
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: 15:22