Selling Goods by Numbers and Estimate and Unknown Items

4. Humayd ibn Ziyad has narrated from al-Hassan ibn Muhammad ibn Sama‘ah from those whom he has mentioned 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 عليه السلام, about the case of a man who buys something which is sold by measure or weight and takes it according to that standard. He (the Imam) said, ‘It is not harmful.’”