Adam Clarke on Matthew 26:47

Judas, one of the twelve - More deeply to mark his base ingratitude and desperate wickedness - He was One of the Twelve - and he is a Traitor, and one of the vilest too that ever disgraced human nature.

A great multitude with swords and staves - They did not come as officers of justice, but as a desperate mob. Justice had nothing to do in this business. He who a little before had been one of the leaders of the flock of Christ is now become the leader of ruffians and murderers! What a terrible fall!