22. A number of our people have narrated from Sahl ibn Ziyad from Mu‘awiyah ibn Hakim from ibn Shu’ayb al-Muhamiliy al-Rifa‘iy who has said the following:

“I once asked abu ‘ Abd Allah , about the case of a man who hires a man to dig for him a well as deep as ten times the height of a man for ten dirham; but then he fails to do so because of weakness. He (the Imam) said, ’Ten must be divided into fifty-five of which one is for the first length, two for the second and three for the third in the same way until the tenth.’”