Bede the Venerable
Catena Aurea · Markusevangelium 14
And Judas Iscariot, one of the twelve, went unto the Chief Priests, to betray him unto them. And when they heard it, they were glad, and promised to give him money. And he sought how he might conveniently betray him.
But by the words, he went out, it is shewn that he was not invited by the Chief Priests, nor bound by any necessity, but entered upon this design from the spontaneous wickedness of his own mind.