Daraqutni

Ishaq bin Salman narrates: I asked Imam Malik, "O Abu Abdullah! What was the weight of the specific sa’ of the Prophet (peace be upon him)?" He replied, "According to the Iraqi ratl, it is five ratl and one third of a ratl. I have measured it." I said, "O Abu Abdullah! You have given a fatwa against the elder of your time." He asked, "Who is that?" I said, "Imam Abu Hanifa! Because he says it is eight ratl." Imam Malik became angry and said, "May Allah ruin them! How daring they have been regarding Allah, the Exalted." Then he said to one of those sitting there, "O so-and-so! Bring the sa’ of your forefather. O so-and-so! Bring the sa’ of your uncle. O so-and-so! Bring the sa’ of your grandmother." The narrator named Ishaq says: Various sa’s were gathered there. Imam Malik said, "According to what do you people preserve it (i.e., to what is it attributed)?" That person said, "My father narrated from his father that he gave (charity) to the Prophet (peace be upon him) according to this sa’." The second person said, "My father narrated from his brother that he gave (charity) to the Prophet (peace be upon him) according to this sa’." The third said, "My father told me, and he narrated from his mother that she gave (charity) to the Prophet (peace be upon him) according to this sa’." Imam Malik said: "When I measured it, it was five ratl and one third of a ratl." The narrator says: I said, "O Abu Abdullah! I will tell you something even more astonishing about them (i.e., Imam Abu Hanifa). They say that in Sadaqat al-Fitr, half a sa’ should be given, and one sa’ is eight ratl." Imam Malik said, "This is even more astonishing. They have erred in the measurement and reduced the amount to be given. No! A complete sa’ should be given on behalf of every person. We have heard the scholars of our city (Madina Munawwara) say this."