Mishkat al-Masabih 6 Zakat كتاب الزكاة 48

عَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بَعَثَ مُنَادِيًا فِي فِجَاجِ مَكَّةَ: «أَلَا إِنَّ صَدَقَةَ الْفِطْرِ وَاجِبَةٌ عَلَى كُلِّ مُسْلِمٍ ذَكَرٍ أَوْ أُنْثَى حُرٍّ أَوْ عَبْدٍ صَغِيرٍ أَوْ كَبِيرٍ مُدَّانِ مِنْ قَمْحٍ أَوْ سِوَاهُ أَوْ صَاع من طَعَام» . رَوَاهُ التِّرْمِذِيّ

‘Amr b. Shu’aib on his father’s authority said his grandfather told that the Prophet sent someone to announce in the ravines of Mecca, “The sadaqa relating to the breaking of the fast is incumbent on every Muslim, male or female, freeman or slave, young or old, consisting of two mudds of wheat or such like, or a sa’ of grain.” Tirmidhi transmitted it.