Musannaf Ibn Abi Shaybah 10950 — What the sa is

Mughirah said: In the matters on which Ibrahim gave fatwas, whether the expiation for an oath, or purchasing, or feeding sixty poor people, and in what he said the tithe or half-tithe was due on, he used to give his fatwa by the Hajjaji qafiz, and he said: It is the sa'.