John 13:18 I am not referring to all of you; I know those I have chosen. But this is to fulfil this passage of Scripture: ‘He who shared my bread has turned against me.’
Just because Christ says we are not all clean does not mean we are all permanently excluded from His life! Far from it, we are all included until we choose to be excluded!
Judas may have sat with Christ and the disciples to eat, drink and live a life of a disciple; but he chose to sin against God by giving in to the temptation of money.
God knew we would all make mistakes and therefore prepared a sacrifice which would be enough to pay for all of our sins once and for all. Accept Jesus as your Saviour!