Sunan Abi Dawud 4947
سنن أبي داود#4947Sahihحَدَّثَنَا مُحَمَّدُ بْنُ كَثِيرٍ، أَخْبَرَنَا سُفْيَانُ، عَنْ أَبِي مَالِكٍ الأَشْجَعِيِّ، عَنْ رِبْعِيِّ بْنِ حِرَاشٍ، عَنْ حُذَيْفَةَ، قَالَ قَالَ نَبِيُّكُمْ صلى الله عليه وسلم " كُلُّ مَعْرُوفٍ صَدَقَةٌ " .
Hudhaifah said :Your prophet (May peace be upon him) said : Every good act is a SADAQAH (almsgiving)
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:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih Muslim (1005)
In-book reference: 43:175