2. Al-Baqara (The Cow)

Surah: 2   Aya: 120

120. Walan tarda AAanka alyahoodu wala alnnasara hatta tattabiAAa millatahum qul inna huda Allahi huwa alhuda wala-ini ittabaAAta ahwaahum baAAda allathee jaaka mina alAAilmi ma laka mina Allahi min waliyyin wala naseerin
  

  Translation

120. Never will the Jews nor the Christians be pleased with you (O Muhammad Peace be upon him ) till you follow their religion. Say: "Verily, the Guidance of Allâh (i.e. Islâmic Monotheism) that is the (only) Guidance. And if you (O Muhammad Peace be upon him ) were to follow their (Jews and Christians) desires after what you have received of Knowledge (i.e. the Qur'ân), then you would have against Allâh neither any Walî (protector or guardian) nor any helper.