The Qur'an is direct with anyone who trades: give full measure and honest weight, and beware taking in full from people while shortchanging them in return. Fair dealing is not merely good business — it is a matter of faith.
“Woe to those who give less [than due], Who, when they take a measure from people, take in full. But if they give by measure or by weight to them, they cause loss.”— 83:1-3 (Saheeh International)
“And establish weight in justice and do not make deficient the balance.”— 55:9 (Saheeh International)
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