“It’s not allowed for a person who sees someone being duped at a shop to stay silent: [he sees someone] asking about the price of some goods and the shop owner tells him that its price is a hundred but that person [watching] knows that it’s [really] fifty, rather it’s waajib for him to tell that customer that its price is fifty in the markets—and that is not regarded as cutting off someone’s sustenance, as some of the common folk think.”

– Shaykh Muhammad ibn Saalih ibn Uthaymeen (رحمه الله)
[Sharh Bulughul-Maraam, vol. 9, p. 315]
Like