By this isnad from Muhammad b. Ahmad from `Amr b. `Ali b. `Umar b. Yazid from his uncle Muhammad b. `Umar from his father from Abi `Abdillah al-Sadiq from his forefathers . He said:

The Messenger of Allah (s) said: Whoever gives one carat to one from my Ahl al-Bayt in this world will be rewarded on the Day of Resurrection with a kantar.