Surah Ghafir 40:25

فَلَمَّا جَآءَهُم بِٱلْحَقِّ مِنْ عِندِنَا قَالُوا۟ ٱقْتُلُوٓا۟ أَبْنَآءَ ٱلَّذِينَ ءَامَنُوا۟ مَعَهُۥ وَٱسْتَحْيُوا۟ نِسَآءَهُمْ ۚ وَمَا كَيْدُ ٱلْكَـٰفِرِينَ إِلَّا فِى ضَلَـٰلٍ

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.

Translation: Saheeh International

Tafsir

So when he brought them the truth from Us they said ‘Slay the sons of those who believe with him and spare keep alive their women’. But the guile of the disbelievers is ever in error in perdition.

Excerpt from Tafsir al-Jalalayn, commentary on 40:25, via Quran.com. The reader has the full commentary and 9 more tafsirs.