53وَإِذْ ءَاتَيْنَا مُوسَى ٱلْكِتَـٰبَ وَٱلْفُرْقَانَ لَعَلَّكُمْ تَهْتَدُونَ
[53] Remember that (at that very time, when you were committing this gross iniquity) We gave Moses the Book and the criterion of right and wrong69 so that you might be guided aright.
69"Furqan": a criterion for distinguishing truth from falsehood. Here it stands for the knowledge and understanding of religion which enables a person to discern between right and wrong, truth and falsehood.