An-Naml 27:49

قَالُوا۟ تَقَاسَمُوا۟ بِٱللَّهِ لَنُبَيِّتَنَّهُۥ وَأَهْلَهُۥ ثُمَّ لَنَقُولَنَّ لِوَلِيِّهِۦ مَا شَهِدْنَا مَهْلِكَ أَهْلِهِۦ وَإِنَّا لَصَـٰدِقُونَ

Qālū taqāsamū bil-lahi lanubayyitannahu wa-ahlahu thumma lanaqūlanna liwaliyyihi mā shahid'nā mahlika ahlihi wa-innā laṣādiqūna

They said, "Take a mutual oath by Allāh that we will kill him by night, he and his family. Then we will say to his executor, 'We did not witness the destruction of his family, and indeed, we are truthful.'"