Surah Ghafir, ayah 25

40:25

فَلَمَّا جَآءَهُم بِٱلۡحَقِّ مِنۡ عِندِنَا قَالُواْ ٱقۡتُلُوٓاْ أَبۡنَآءَ ٱلَّذِينَ ءَامَنُواْ مَعَهُۥ وَٱسۡتَحۡيُواْ نِسَآءَهُمۡۚ وَمَا كَيۡدُ ٱلۡكَٰفِرِينَ إِلَّا فِي ضَلَٰلٖ ٢٥

Falammā jā'ahum bil-haqqi min 'indinā qāluqtulū abnā'al-ladhīna āmanū ma'ahū wastahyū nisā'ahum wamā kaydul-kāfirīna illā fī dalāl

And when he brought them the truth from Us, they said, "Kill the sons of those who have believed with him and keep their women alive." But the plan of the disbelievers is not except in error.