قَالُوا۟ فَمَا جَزَٰٓؤُهُۥٓ إِن كُنتُمْ كَـٰذِبِينَ
Qaaloo famaa jazaaa'u hooo in kuntum kaazibeen
They asked them, ‘And if we find that you are lying, what penalty shall we apply to you?’
They said, "And what is the penalty for it, if you are lying?"