Luke 22:3-6

Then Satan entered Judas, the one called Iscariot, who was one of the twelve [disciples]. And he went away and discussed with the chief priests and officers how he might betray Him and hand Him over to them. They were delighted and agreed with him to give him money. So he consented, and began looking for a good opportunity to betray Jesus to them [at a time when He was] separated from the crowd [because the people might riot or stop them from seizing Him].