الكافي- ط الاسلامية, volume 5, page 179

4. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hammad from al-Halabiy who has said the following: “About the case of a man who buys food from another man, a package by means of known measurement then the party asks the buyer to buy from him another similar package without measurement, because it is similar to the other package already bought. He (the Imam) said, ‘It is not valid without measurement.’ He (the Imam) said, ‘Venturous estimation in food items which are exchanged by measurement is not valid and it is of undesirable matters in food items.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

5. Humayd ibn Ziyad has narrated from al-Hassan ibn Muhammad ibn Sama‘ah from more than one person from Aban ibn ‘Uthman from ‘Abd al-Rahman ibn abu ‘Abd Allah who has said the following: “This is concerning my question before abu ‘Abd Allah (a.s.), about the case of a man who owes one kur (a certain amount) of food. He then buys one kur of food from another man and asks his creditor to come to receive the Kur of food owed to him. He (the Imam) said, ‘Such a transaction is not harmful.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

6. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Safwan ibn Yahya from Ishaq ibn ‘Ammar from abu al-‘Atarud who has said the following: “I once said to abu ‘Abd Allah (a.s.), that I buy food in a deal in the beginning of which I lose and in the end I gain profit. I then ask my friend to reduce a certain amount on each kur. He (the Imam) said, ‘There is nothing good in it, however, he can reduce a certain sum.’ I then asked, ‘Can he reduce more than I have lost?’ He (the Imam) said, ‘It is not harmful.’ I then asked if I can keep aside one or two kur and the man asks me to give him according to my measurement. He (the Imam) said, ‘It is not harmful if he can trust you.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

7. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Safwan ibn Yahya from abu Sa‘id al-Mukariy from ‘Abd al-Malik ibn ‘Amr who has said the following: “This is concerning my question before abu ‘Abd Allah (a.s.), about food that I buy and I measure it when someone witnesses my measuring but I measure it for myself. He then says, ‘Sell it to me.’ I then sell it to him by means of the same measurement that I made for myself. He (the Imam) said, ‘It is not harmful.”’

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.