16 and from then on he began to look for an opportunity to betray Jesus.
Matthew 26:16 Cross References - ISV
Mark 14:11
11 After they had listened to him, they were delighted and promised to give him money. So he began to look for a good opportunity to betray him.
Luke 22:6
6 Judas accepted their offer and began to look for a good opportunity to betray Jesus to them when no crowd was present.