MAKE due allowance for man's nature, and enjoin the doing of what is right; and leave alone all those who choose to remain ignorant.
Al-A'raf (The Heights) Verse 199
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