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Quran 26:181 — The Poets (Al-Shu`ara')

أَوفُوا الكَيلَ وَلا تَكونوا مِنَ المُخسِرينَ

"You shall give full measure when you trade; do not cheat.

[26:180] "I do not ask you for any wage; my wage comes only from the Lord of the universe.

[26:182] "You shall weigh with an equitable scale.