Sunan Ibn Majah 1830
سنن ابن ماجه#1830Sahihحَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ سَعْدِ بْنِ عَمَّارٍ الْمُؤَذِّنِ، حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، عَنْ عَمَّارِ بْنِ سَعْدٍ، مُؤَذِّنِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ أَمَرَ بِصَدَقَةِ الْفِطْرِ صَاعًا مِنْ تَمْرٍ أَوْ صَاعًا مِنْ شَعِيرٍ أَوْ صَاعًا مِنْ سُلْتٍ .
It was narrated from Ammar bin Sa'eed, the Mu'adhdhin of the Messenger of Allah from his father,:that the Messenger of Allah enjoined Sadaqatul-Fitr, one Sa of dates, one Sa of barley, or one Sa of Sult (a kind of barley without skin on it, resembling wheat)
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: 8:48