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 ʿId prayer. (One Sa' = 3 Kilograms approx.) (Using translation from Bukhārī 1503)
فَرَضَ النَّبِيُّ ﷺ زَكَاةَ الْفِطْرِ صَاعًا مِنْ تَمْرٍ أَوْ صَاعًا مِنْ شَعِيرٍ عَنِ الْحُرِّ وَالْعَبْدِ وَالذَّكَرِ وَالْأُنْثَى وَالصَّغِيرِ وَالْكَبِيرِ مِنَ الْمُسْلِمِينَ وَأَنَّ النَّبِيَّ ﷺ أَمَرَ بِأَدَاءِ زَكَاةِ الْفِطْرِ قَبْلَ خُرُوجِ النَّاسِ إِلَى الصَّلَاةِ