A man who buys something and finds it more or less than agreed

Muhammad and al-Hasan (may Allah have mercy on them) both say, concerning a man who sells a basket of dates or a hullah, and then the remainder of it is given to him by count, measured by it: both of them disliked this.

It is reported from Qatadah and Abu Hashim that a man bought ten thousand walnuts for thirty dirhams, by count. Then they were put into one or two clay jars, and then they began counting the remainder according to the two jars. Both of them disliked this.