Surah At-Tawbah — Ayah 115 (9:115)
وَمَا كَانَ ٱللَّهُ لِيُضِلَّ قَوۡمَۢا بَعۡدَ إِذۡ هَدَىٰهُمۡ حَتَّىٰ يُبَيِّنَ لَهُم مَّا يَتَّقُونَۚ إِنَّ ٱللَّهَ بِكُلِّ شَيۡءٍ عَلِيمٌ ١١٥
English translation (Saheeh International)
And Allāh would not let a people stray after He has guided them until He makes clear to them what they should avoid. Indeed, Allāh is Knowing of all things.
Brief commentary
Allah would never pass the judgement of misguidance against a people, after He had given them guidance, until He makes clear to them those forbidden things that they must avoid. If they do that which Allah had forbidden after it has been declared forbidden and made clear to them, then He will judge them as misguided. Allah knows everything. Nothing is hidden from Him. He has taught you what you did not know.