2. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Safwan from Ishaq ibn ‘Ammar from abu Basir who has said the following: “Abu ‘Abd Allah , has said, ‘You must not rent land in exchange for dates, wheat, barley, al-Arbi‘a’ or al-Nitaf.’ I then asked, ‘What is al-Arbi‘a?’ He (the Imam) said, ‘It is a small amount of water and al-Nitaf means extra water, but rent it in exchange for gold or silver, for half of the produce, one-third or one-fourth.’”