Surah Ghafar (The Forgiver), Verse 25

فَلَمَّا جَآءَهُمْ بِالْحَقِّ مِنْ عِنْدِنَا قَالُوا اقْتُلُوْۤا اَبْنَآءَ الَّذِیْنَ اٰمَنُوْا مَعَهٗ وَاسْتَحْیُوْا نِسَآءَهُمْ وَمَا كَیْدُ الْكٰفِرِیْنَ اِلَّا فِیْ ضَلٰلٍ ۟

Falamma jaaa'ahum bil haqqi min 'indinaa qaaluq tulooo abnaaa'al lazeena aamanoo ma'ahoo wastahyoo nisaaa'ahum; wa maa kaidul kaafireena illaa fee dalaal

“Now, when he came to them in Truth, from Us, they said, "Slay the sons of those who believe with him, and keep alive their females," but the plots of Unbelievers (end) in nothing but errors (and delusions)!...”

Quran 40:25 (Yusuf Ali Translation)