"We would give Zakat Al-Fitr - when the Messenger of Allah was among us - as a Sa of food, or a Sa of barely, or a Sa of dried dates, or a Sa of raisins, or a Sa of cheese. So we did not stop paying it (like that) until Mu'awiyah arrived in Al-Madinah and talked (about it). Among the things he addressed the people with, he said: 'I see that two Mudd of the wheat of Ash-Sham are equal to a Sa of dried dates.' So the people followed that." Abu Sa'eed said: "I will not stop giving it in the manner that I had been giving it."
كُنَّا نُخْرِجُ زَكَاةَ الْفِطْرِ إِذْ كَانَ فِينَا رَسُولُ اللَّهِ ﷺ صَاعًا مِنْ طَعَامٍ أَوْ صَاعًا مِنْ شَعِيرٍ أَوْ صَاعًا مِنْ تَمْرٍ أَوْ صَاعًا مِنْ زَبِيبٍ أَوْ صَاعًا مِنْ أَقِطٍ فَلَمْ نَزَلْ نُخْرِجُهُ حَتَّى قَدِمَ مُعَاوِيَةُ الْمَدِينَةَ فَتَكَلَّمَ فَكَانَ فِيمَا كَلَّمَ بِهِ النَّاسَ إِنِّي لأَرَى مُدَّيْنِ مِنْ سَمْرَاءِ الشَّامِ تَعْدِلُ صَاعًا مِنْ تَمْرٍ قَالَ فَأَخَذَ النَّاسُ بِذَلِكَ قَالَ أَبُو سَعِيدٍ فَلاَ أَزَالُ أُخْرِجُهُ كَمَا كُنْتُ أُخْرِجُهُ