۞ وَإِلَىٰ مَدْيَنَ أَخَاهُمْ شُعَيْبًا ۚ قَالَ يَا قَوْمِ اعْبُدُوا اللَّهَ مَا لَكُم مِّنْ إِلَٰهٍ غَيْرُهُ ۖ وَلَا تَنقُصُوا الْمِكْيَالَ وَالْمِيزَانَ ۚ إِنِّي أَرَاكُم بِخَيْرٍ وَإِنِّي أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ مُّحِيطٍ (84)
(11:84) And to (the people of) Midian We sent their brother Shu'ayb. *94 He said: 'My people! Serve Allah; you have no god other than Him. And do not diminish the measure and weight. Indeed I see that you are prospering now, but I fear for you the chastisement of an encompassing day in the future.
*94). For details see Towards Understanding the Qur'an, vol. Ill, al-A'raf, nn. 69-75, pp. 53-7.