Sahih al-Bukhari 1506
صحيح البخاري#1506Sahihحَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عِيَاضِ بْنِ عَبْدِ اللَّهِ بْنِ سَعْدِ بْنِ أَبِي سَرْحٍ الْعَامِرِيِّ، أَنَّهُ سَمِعَ أَبَا سَعِيدٍ الْخُدْرِيَّ ـ رضى الله عنه ـ يَقُولُ كُنَّا نُخْرِجُ زَكَاةَ الْفِطْرِ صَاعًا مِنْ طَعَامٍ، أَوْ صَاعًا مِنْ شَعِيرٍ، أَوْ صَاعًا مِنْ تَمْرٍ، أَوْ صَاعًا مِنْ أَقِطٍ، أَوْ صَاعًا مِنْ زَبِيبٍ.
Narrated Abu Sa`id Al-Khudri:We used to give one Sa' of meal or one Sa' of barley or one Sa' of dates, or one Sa' of cottage cheese or one Sa' of Raisins (dried grapes) as Zakat-ul-Fitr
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: 24:106