Qur'an 11:84

۞ وَإِلَىٰ مَدْيَنَ أَخَاهُمْ شُعَيْبًا ۚ قَالَ يَـٰقَوْمِ ٱعْبُدُوا۟ ٱللَّهَ مَا لَكُم مِّنْ إِلَـٰهٍ غَيْرُهُۥ ۖ وَلَا تَنقُصُوا۟ ٱلْمِكْيَالَ وَٱلْمِيزَانَ ۚ إِنِّىٓ أَرَىٰكُم بِخَيْرٍ وَإِنِّىٓ أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ مُّحِيطٍ

And unto Midian (We sent) their brother Shu'eyb. He said: O my people! Serve Allah. Ye have no other Allah save Him! And give not short measure and short weight. Lo! I see you well-to-do, and lo! I fear for you the doom of a besetting Day.