[Machine] That he heard Ali ibn Abi Talib commanding the payment of Zakat al-Fitr, saying it is a saa' (a specific measurement) of dates or a saa' of barley or a saa' of wheat or salt or raisins. This is a hadith of Abu Bakr and Abu Abdullah does not mention Uthman bin Abdullah in its chain of narration. It is narrated as marfu' (elevated) and the mawquf (stopped) narration is more authentic.  

أَنَّهُ سَمِعَ عَلِيَّ بْنَ أَبِي طَالِبٍ ؓ يَأْمُرُ بِزَكَاةِ الْفِطْرِ فَيَقُولُ هِيَ صَاعٌ مِنْ تَمْرٍ أَوْ صَاعٌ مِنْ شَعِيرٍ أَوْ صَاعٌ مِنْ حِنْطَةٍ أَوْ سلْتٍ أَوْ زَبِيبٍ هَذَا حَدِيثُ أَبِي بَكْرٍ وَلَمْ يَذْكُرْ أَبُو عَبْدِ اللهِ فِي إِسْنَادِهِ عُتْبَةَ بْنَ عَبْدِ اللهِ وَرُوِيَ ذَلِكَ مَرْفُوعًا وَالْمَوْقُوفُ أَصَحُّ