It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with both of them) that the Prophet (peace and blessings be upon him) prescribed one sa’ of dates or one sa’ of barley as Zakat al-Fitr upon every young and old, free and slave.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5174
Hadith Gradingحکم دارالسلام:إسناده صحيح ، خ : 1512 ، م : 984 .