9. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ja’far ibn Ibrahim ibn Muhammad al-Hamadhaniy, who accompanied us to Hajj, has said the following:

“I once wrote to abu al-Hassan , through my father asking, ‘May I be sacrificed for you, our people have differences about al-Sa’. Some of them say that al-Fitra is by al-Sa‘ al-Madaniy and others say it is by al-Sa‘ al-‘Iraqiy. He (the Imam) wrote back to me: ‘Al-Sa‘ is six Artal by al-Madaniy, and nine Artal by al-‘Iraqiy.’ He (the Imam) informed me that it weighs one thousand one hundred seventy Waznah (a certain unit of measurement).”’