Sahih al-Bukhari 1508
صحيح البخاري#1508Sahihحَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُنِيرٍ، سَمِعَ يَزِيدَ الْعَدَنِيَّ، حَدَّثَنَا سُفْيَانُ، عَنْ زَيْدِ بْنِ أَسْلَمَ، قَالَ حَدَّثَنِي عِيَاضُ بْنُ عَبْدِ اللَّهِ بْنِ أَبِي سَرْحٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ـ رضى الله عنه ـ قَالَ كُنَّا نُعْطِيهَا فِي زَمَانِ النَّبِيِّ صلى الله عليه وسلم صَاعًا مِنْ طَعَامٍ، أَوْ صَاعًا مِنْ تَمْرٍ، أَوْ صَاعًا مِنْ شَعِيرٍ، أَوْ صَاعًا مِنْ زَبِيبٍ، فَلَمَّا جَاءَ مُعَاوِيَةُ وَجَاءَتِ السَّمْرَاءُ قَالَ أُرَى مُدًّا مِنْ هَذَا يَعْدِلُ مُدَّيْنِ.
Narrated Abu Sa`id Al-Khudri:In the lifetime of the Prophet (ﷺ) we used to give one Sa' of food or one Sa' of dates or one Sa' of barley or one Sa' of Raisins (dried grapes) as Sadaqat-ul-Fitr. And when Muawiya became the Caliph and the wheat was (available in abundance) he said, "I think (observe) that one Mudd (of wheat) equals two Mudds (of any of the above mentioned things)
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:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 24:108