Behold, as for those who are bent on denying the truth and die as deniers of the truth -their due is rejection by God, and by the angels,, and by all [righteous] men.
Al-Baqara (The Cow) Verse 161
Allah's Apostle said, "Whenever you hear the Adhan, say what the Mu'adhdhin is saying.
Sahih Bukhari: Volume 1, Book 11, Number 585