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

Wherefore if they contend with thee, say thou: have surrendered myself unto Allah and he who followeth me. And say thou unto those who have been vouchsafed the Book and unto the illiterates; do you (also) accept Islam? Then if they accept Islam, they are of a surety guided; and if they turn away, then upon thee is only the preaching, and Allah is Beholder of His bondsmen.