Remind them that God has declared that He will rise up against them different people [the last one being the Nazis during 1940s] who will subject them to the harshest persecution over and over again till the Day of Resurrection. Your Lord is the most efficient in punishment and [at the same time] the Most Forgiving [as He has let them to establish their own state of Israel and start acting unjust] and the Most Merciful [leaving the doors open to them to repent and submit themselves to the will of God ("be a Muslim" in Arabic language.)]