Musannaf Ibn Abi Shaybah 10628 — Sadaqat al-Fitr: those who said half

It is narrated from Sa'id bin al-Musayyib, as a marfu' report (attributed to the Prophet), that the Prophet (peace and blessings be upon him) was asked about Sadaqat al-Fitr, and he (peace and blessings be upon him) said: "On the young and the old, the free and the slave: half a sa' of wheat, or one sa' of dates or of barley."