20. If they argue with you, O Messenger, about the truth that has been revealed to you, then say to them in reply, ‘I and the believers who follow me have submitted to Allah’. Also, say, O Messenger, to the People of the Scripture and the idolaters, ‘Do you submit to Allah sincerely, following what I have brought?’ If they submit to Allah and follow your sacred law, then they are on the path of guidance. If they turn away from Islam, then your duty is only to give your message to them; then Allah will decide about them. He watches His servants and will reward them according to their actions.