Surah Ash-Shu'ara, ayah 182

وَزِنُواْ بِٱلۡقِسۡطَاسِ ٱلۡمُسۡتَقِيمِ ١٨٢

Wazinū bil-qistāsil-mustaqīm

And weigh with an even [i.e., honest] balance.