فَتَنَازَعُوا أَمْرَهُم بَيْنَهُمْ وَأَسَرُّوا النَّجْوَىٰ

Maka mereka berbantah-bantahan tentang urusan mereka di antara mereka dan mereka merahasiakan percakapan (mereka).

So they disputed over their affair among themselves and concealed their private conversation.