Now the festival of the unfermented cakes, the so-called Passover, was getting near. 2 Also, the chief priests and the scribes were seeking the effective way for them to get rid of him, for they were in fear of the people. 3 But Satan entered into Judas, the one called Iscariot, who was numbered among the twelve; 4 and he went off and talked with the chief priests and temple captains about the effective way to betray him to them. 5 Well, they rejoiced and agreed to give him silver money. 6 So he consented, and he began to seek a good opportunity to betray him to them without a crowd around.
Mark 14:1, 2, 10, 11
Now the passover and the festival of unfermented cakes was two days later. And the chief priests and the scribes were seeking how to seize him by crafty device and kill him; 2 for they repeatedly said: "Not at the festival; perhaps there might be an uproar of the people."
...10 And Judas Iscariot, one of the twelve, went off to the chief priests in order to betray him to them. 11 When they heard it, they rejoiced and promised to give him silver money. So he began seeking how to betray him conveniently.