بُلُوغُ الْمَرَامِ
Bulugh al-Maram 627
The Book of Zakah
عَنِ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: { فَرَضَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -زَكَاةَ اَلْفِطْرِ, صَاعًا مِنْ تَمْرٍ, أَوْ صَاعًا مِنْ شَعِيرٍ: عَلَى اَلْعَبْدِ وَالْحُرِّ, وَالذَّكَرِ, وَالْأُنْثَى, وَالصَّغِيرِ, وَالْكَبِيرِ, مِنَ اَلْمُسْلِمِينَ, وَأَمَرَ بِهَا أَنْ تُؤَدَّى قَبْلَ خُرُوجِ اَلنَّاسِ إِلَى اَلصَّلَاةِ } مُتَّفَقٌ عَلَيْه ِ [1] .
Ibn ’Umar (RAA) narrated, The Messenger of Allah (ﷺ) enjoined the payment of one sa” of dates or one sa' of barley as Zakat-ul-fitr on every Muslim, slave or free, male or female, young or old, and he ordered that it be paid before the people went out to offer the 'Id prayer.’ Agreed upon.
Sunnah.com reference: Book 4, Hadith 29