Surah Qaf (Qaf), Verse 45

نَحْنُ اَعْلَمُ بِمَا یَقُوْلُوْنَ وَمَاۤ اَنْتَ عَلَیْهِمْ بِجَبَّارٍ فَذَكِّرْ بِالْقُرْاٰنِ مَنْ یَّخَافُ وَعِیْدِ 

Nahnu a'lamu bimaa yaqooloona wa maaa anta 'alaihim bijabbaarin fazakkir bil quraani many yakhaafu wa'eed

“We know best what they say; and thou art not one to overawe them by force. So admonish with the Qur'an such as fear My Warning!”

Quran 50:45 (Yusuf Ali Translation)