Yahya bin Bukayr (may Allah have mercy on him) narrated the hadith with the same chain, that the Messenger of Allah (peace and blessings be upon him) said: "Sadaqat al-fitr is obligatory upon every free and slave Muslim, whether male or female: a sa' of dates or a sa' of barley."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7691