Muhammad

God may forgive every sin, except in the case of one who dies a polytheist, or one who purposely kills a believer.

He who has in his heart as much faith as a grain of mustard seed will not enter hell, and he who has in his heart as much pride as a grain of mustard seed will not enter paradise.

What is Faith? When your good deed pleases you and your evil deed grieves you, you are a believer. What is Sin? When a thing disturbs (the peace of) your heart, give it up.

A Muslim has five duties towards another Muslim; to return a salutation, visit the sick, follow funerals, accept an invitation and say 'God have mercy on you' when one sneezes.

If anyone claims what is not his, he does not belong to us, and let him come to his seat in hell.

Coarse talk does not come into anything without disgracing it, and modesty does not come into anything without adorning it.

The strong man is not the good wrestler; the strong man is only the one who controls himself when he is angry.

Every fault but a debt will be forgiven to a martyr.

What I have forbidden to you, avoid; what I have ordered you [to do], do as much of it as you can. It was only their excessive questioning and their disagreeing with their Prophets that destroyed those who were before you.

A creature is not to be obeyed when it involves disobedience to the Creator.