"At the time of the Messenger of Allah, the people used to give as Sadaqatul Fitr a Sa' of barely or dates or rye or raising."  

عَنْ صَدَقَةِ الْفِطْرِ فِي عَهْدِ النَّبِيِّ ﷺ صَاعًا مِنْ شَعِيرٍ أَوْ تَمْرٍ أَوْ سُلْتٍ أَوْ زَبِيبٍ