Chapter on Trade, Its Etiquettes, Virtues, and Jurisprudence

It is narrated from Ishaq ibn Ammar who said: I said to Abu Abdillah عليه السلام, "I receive dirhams from a man, weigh them, then distribute them, and a surplus remains in my hand. What should I do?" Imam عليه السلام said: "Did you not strive to be accurate in your measure?" I said: "Yes." Imam عليه السلام said: "Then there is no harm."