Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
muslim:985eʿAmr al-Nāqid > Ḥātim b. Ismāʿīl > Ibn ʿAjlān > ʿIyāḍ b. ʿAbdullāh b. Abū Sarḥ > Abū Saʿīd al-Khudrī

I would take out (Sadaqat-ul-Fitr) but that which I used to bring forth during the lifetime of the Messenger of Allah ﷺ one sa' of dates, or one sa' of raisins, or one sa' of barley, or one sa' of cheese.  

مسلم:٩٨٥eوَحَدَّثَنِي عَمْرٌو النَّاقِدُ حَدَّثَنَا حَاتِمُ بْنُ إِسْمَاعِيلَ عَنِ ابْنِ عَجْلاَنَ عَنْ عِيَاضِ بْنِ عَبْدِ اللَّهِ بْنِ أَبِي سَرْحٍ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ

أَنَّ مُعَاوِيَةَ لَمَّا جَعَلَ نِصْفَ الصَّاعِ مِنَ الْحِنْطَةِ عِدْلَ صَاعٍ مِنْ تَمْرٍ أَنْكَرَ ذَلِكَ أَبُو سَعِيدٍ وَقَالَ لاَ أُخْرِجُ فِيهَا إِلاَّ الَّذِي كُنْتُ أُخْرِجُ فِي عَهْدِ رَسُولِ اللَّهِ ﷺ صَاعًا مِنْ تَمْرٍ أَوْ صَاعًا مِنْ زَبِيبٍ أَوْ صَاعًا مِنْ شَعِيرٍ أَوْ صَاعًا مِنْ أَقِطٍ