سورة Al-Imran ( The Famiy of Imran ) - الآية 20

If they argue with you, say, ‘I have submitted my will to Allah, and [so has] he who follows me.’ And say to those who were given the Book and the uninstructed ones, ‘Do you submit?’ If they submit, they will certainly be guided; but if they turn away, then your duty is only to communicate, and Allah watches His servants.