سنن أبي داود

Narrated Qudamah ibn Wabirah:

The Prophet (ﷺ) said: If anyone omits the Friday prayer without excuse, he must give one dirham or half a dirham, or one sa' or half a sa' of wheat, in alms.

Abu Dawud said: Sa'id b. Bashir reported this tradition in a like manner, except that he narrated "one mudd or half mudd" (instead of sa'). He narrated it from Samurah.

Abu Dawud said: I heard Ahmad bin Hanbal being asked about the differences over the narration of this Hadith. He said: "Hammam has a stronger memory - in my opinion - than Ayyub."