Musannaf Ibn Abi Shaybah 22392 — A man who sells measured goods

Tawus disliked that anyone should sell ghee and olive oil in such a way that he deducts something on account of the container, and he would say: "No, except by pouring it out or by weighing it." (For example, he weighs the container and what is inside it as one hundred kilograms, then deducts ten grams from the hundred on the grounds that it is the weight of the container.)