حَدَّثَنَا يَحْيَى بْنُ مُحَمَّدِ بْنِ السَّكَنِ، حَدَّثَنَا مُحَمَّدُ بْنُ جَهْضَمٍ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ، عَنْ عُمَرَ بْنِ نَافِعٍ، عَنْ أَبِيهِ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، قَالَ فَرَضَ رَسُولُ اللَّهِ صلى الله عليه وسلم زَكَاةَ الْفِطْرِ صَاعًا فَذَكَرَ بِمَعْنَى مَالِكٍ زَادَ وَالصَّغِيرِ وَالْكَبِيرِ وَأَمَرَ بِهَا أَنْ تُؤَدَّى قَبْلَ خُرُوجِ النَّاسِ إِلَى الصَّلاَةِ ‏.‏ قَالَ أَبُو دَاوُدَ رَوَاهُ عَبْدُ اللَّهِ الْعُمَرِيُّ عَنْ نَافِعٍ بِإِسْنَادِهِ قَالَ عَلَى كُلِّ مُسْلِمٍ وَرَوَاهُ سَعِيدٌ الْجُمَحِيُّ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ قَالَ فِيهِ مِنَ الْمُسْلِمِينَ وَالْمَشْهُورُ عَنْ عُبَيْدِ اللَّهِ لَيْسَ فِيهِ مِنَ الْمُسْلِمِينَ ‏.‏

Abd’ Allah b. Umar said : The Messenger of Allah(PBUH)prescribed the sadaqah at the end of Ramadan one sa’. The narrator then transmitted the tradition like the one narrated by Malik. This version adds : “Young and old. He gave command that this should be paid before the people went out to prayers.” Abu Dawud said : ‘Abd Allah al-‘Umari narrated it from Nafi’ through his chain : “on every Muslim.” The version of Sa’id al-Jumahi has : “Among the Muslims.” The well-known version transmitted by ‘Ubaid Allah does not mention the words “among the Muslims” Translation Not Available

Book Ref: Sunan Abi Dawud Book 9 Hadith 1612
Web Ref:  Sunan Abi Dawud Book 9 Hadith 1608