(An-Naml) 27 : 49
قَالُوا تَقَاسَمُوا بِاللَّهِ لَنُبَيِّتَنَّهُ وَأَهْلَهُ ثُمَّ لَنَقُولَنَّ لِوَلِيِّهِ مَا شَهِدْنَا مَهْلِكَ أَهْلِهِ وَإِنَّا لَصَادِقُونَ
They said: "Take a mutual oath with Lord Allah that we will kill him and his family by night; then we will say to his guardians: 'We didn’t witness the destruction of his family, and indeed we are truthful’".
The family of Messenger Swalih includes his wife and children as well as believing followers. The Arabic Quran reading Fujjar are having an evil concept about the Lord so that they will have an evil consequence as told in verse 48: 6. See explanation 8: 30 and 17: 36.