Surah Al-Baqarah (The Cow), Verse 135

وَقَالُوْا كُوْنُوْا هُوْدًا اَوْ نَصٰرٰی تَهْتَدُوْا قُلْ بَلْ مِلَّةَ اِبْرٰهٖمَ حَنِیْفًا وَمَا كَانَ مِنَ الْمُشْرِكِیْنَ ۟

Wa qaaloo koonoo Hoodan aw Nasaaraa tahtadoo; qul bal Millata Ibraaheema Haneefanw wa maa kaana minal mushrikeen

“They say: "Become Jews or Christians if ye would be guided (To salvation)." Say thou: "Nay! (I would rather) the Religion of Abraham the True, and he joined not gods with Allah."”

Quran 2:135 (Yusuf Ali Translation)