'Sin' in the Bible

Because of this I say to you, all sin and evil speaking shall be forgiven to men, but the evil speaking of the Spirit shall not be forgiven to men.

'And if thy brother may sin against thee, go and show him his fault between thee and him alone, if he may hear thee, thou didst gain thy brother;

Then Peter having come near to him, said, 'Sir, how often shall my brother sin against me, and I forgive him -- till seven times?'

I did sin, having delivered up innocent blood;' and they said, 'What -- to us? thou shalt see!'