Hanbal said: Ahmad said: I took the sa' from Abu al-Nadr (16). Abu al-Nadr said: I took it from Ibn Abi Dhu'ayb (17), and he said: "This is the sa' of the Prophet (peace and blessings of Allah be upon him) which is known in Medina." Abu 'Abd Allah [Ahmad] said: So we took lentils and measured with it, as it is the most suitable item with which to measure (18), because it does not settle away from its place. We measured with it, then we weighed it, and it turned out to be five and one-third ratls. He said: "This is the most suitable that we have arrived at, and what has become clear to us regarding the sa' of the Prophet (peace and blessings of Allah be upon him)." If the sa' is five and one-third ratls of wheat (19) and lentils, both of which are among the heaviest grains, then other types of fitra (charity) are lighter than them. So, if one gives five and one-third ratls of them, it is more than a sa'. Muhammad ibn al-Hasan said: If one gives five and one-third ratls of wheat, it does not suffice him, because wheat varies, and it [may be heavy or light] (21). Al-Tahawi said: One should give eight (22) ratls of that whose volume and weight are equal, which are raisins and mung beans. The implication of his statement is that if one gives eight ratls of that which is heavier than them (24), it would not suffice him until he adds something, knowing that it has reached a sa'. It is more appropriate for one who gives from the heavy items by weight to take precautions and add something so that he knows (25) that [it has reached a sa', and the measure of a sa'] (26) in the Damascene ratl,