Surah Al-Nahl (The Bees), Verse 125

اُدْعُ اِلٰی سَبِیْلِ رَبِّكَ بِالْحِكْمَةِ وَالْمَوْعِظَةِ الْحَسَنَةِ وَجَادِلْهُمْ بِالَّتِیْ هِیَ اَحْسَنُ اِنَّ رَبَّكَ هُوَ اَعْلَمُ بِمَنْ ضَلَّ عَنْ سَبِیْلِهٖ وَهُوَ اَعْلَمُ بِالْمُهْتَدِیْنَ ۟

Ud'u ilaa sabeeli Rabbika bilhikmati walmaw 'izatil hasanati wa jaadilhum billatee hiya ahsan; inna Rabbaka huwa a'almu biman dalla 'an sabeelihee wa Huwa a'lamu bilmuhtadeen

“Invite (all) to the Way of thy Lord with wisdom and beautiful preaching; and argue with them in ways that are best and most gracious: for thy Lord knoweth best, who have strayed from His Path, and who receive guidance.”

Quran 16:125 (Yusuf Ali Translation)