Those who have attained to faith, and who have not obscured their faith by wrongdoing-it is they who shall be secure, since it is they who have found the right path!
Al-An'am (The Cattle) Verse 83
I heard Allah's Apostle saying, "The rights of a Muslim on the Muslims are to follow the funeral processions, to accept invitation and to reply the sneezer
Sahih Bukhari: Volume 2, Book 23, Number 332