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Quran 26:182 — The Poets (Al-Shu`ara')

وَزِنوا بِالقِسطاسِ المُستَقيمِ

"You shall weigh with an equitable scale.

[26:181] "You shall give full measure when you trade; do not cheat.

[26:183] "Do not cheat the people out of their rights, and do not roam the earth corruptingly.