now had we so willed we could have shown them clearly to thee so that thou wouldst know them for sure as by a visible mark but thou wilt most certainly recognize them by the tone of their voice. and god knows all that you do 
ولو نشاء لأريناكهم فلعرفتهم بسيماهم ولتعرفنهم في لحن القول والله يعلم أعمالكم