What did the Prophet Muhammad (saw) make incumbent upon every male or female, free man or slave, as Sadaqat-ul-Fitr?
 Narrated Nafi`:                     Ibn `Umar said, "The Prophet made incumbent on every male or female, free man or slave, the payment of one Sa' of dates or barley as Sadaqat-ul-Fitr (or said Sadaqa-Ramadan)." The people then substituted half Sa' of wheat for that. Ibn `Umar used to give dates (as Sadaqat-ul-Fitr). Once there was scarcity of dates in Medina and Ibn `Umar gave barley. 'And Ibn `Umar used to give Sadaqat-ul- Fitr for every young and old person. He even used to give on behalf of my children. Ibn `Umar used to give Sadaqat-ul-Fitr to those who had been officially appointed for its collection. People used to give Sadaqat-ul-Fitr (even) a day or two before the `Id.