Surah Al-A'raf (The Heights), Verse 85

وَاِلٰی مَدْیَنَ اَخَاهُمْ شُعَیْبًا قَالَ یٰقَوْمِ اعْبُدُوا اللّٰهَ مَا لَكُمْ مِّنْ اِلٰهٍ غَیْرُهٗ قَدْ جَآءَتْكُمْ بَیِّنَةٌ مِّنْ رَّبِّكُمْ فَاَوْفُوا الْكَیْلَ وَالْمِیْزَانَ وَلَا تَبْخَسُوا النَّاسَ اَشْیَآءَهُمْ وَلَا تُفْسِدُوْا فِی الْاَرْضِ بَعْدَ اِصْلَاحِهَا ذٰلِكُمْ خَیْرٌ لَّكُمْ اِنْ كُنْتُمْ مُّؤْمِنِیْنَ ۟

Wa ilaa Madyana akhaahum Shu'aybaa; qaala yaa qawmi' budul laaha maa lakum min ilaahin ghairuhoo qad jaaa'atkum baiyinatum mir Rabbikum fa awful kaila walmeezaana wa laa tabkhasun naasa ashyaa'ahum wa laa tufsidoo fil ardi ba'da islaahihaa; zaalikum khairul lakum in kuntum mu'mineen

“To the Madyan people We sent Shu'aib, one of their own brethren: he said: "O my people! worship Allah; Ye have no other god but Him. Now hath come unto you a clear (Sign) from your Lord! Give just measure and weight, nor withhold from the people the things that are their due; and do no mischief on the earth after it has been set in order: that will be best for you, if ye have Faith.”

Quran 7:85 (Yusuf Ali Translation)