2. Al-Baqara (The Cow)

Surah: 2   Aya: 208

208. Ya ayyuha allatheena amanoo odkhuloo fee alssilmi kaffatan wala tattabiAAoo khutuwati alshshaytani innahu lakum AAaduwwun mubeenun
  

  Translation

208. O you who believe! Enter perfectly in Islâm (by obeying all the rules and regulations of the Islâmic religion) and follow not the footsteps of Shaitân (Satan). Verily! He is to you a plain enemy.