Luke 22:1 Now the feast of unleavened bread drew nigh, which is called the Passover.
Luke 22:2 And the chief priests and scribes sought how they might kill him; for they feared the people.
They sought how they might kill Jesus, but in a way that would keep them as the respected leaders of the people. They feared the popularity polls. They would find some lie to teach them, as if it were truth, so that they might kill Jesus, who they were jealous of. Not unlike today's newscasters, they would lie, making the people believe their viewpoint, instead of the obvious truth. Jesus is the Son of God, the messiah sent to deliver the people. Not from Rome, but from their own sins.
Luke 22:3 Then entered Satan into Judas surnamed Iscariot, being of the number of the twelve.
Then entered Satan. You can be sure satan will show up again and again. Jesus spoke to him in the desert, overcoming him by speaking God's written word.
Mat 4:10 Then saith Jesus unto him, Get thee hence, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.
Mat 4:11 Then the devil leaveth him, and, behold, angels came and ministered unto him.
He left, but now he returns in a friend, one of his twelve disciples.
Luke 22:4 And he went his way, and communed with the chief priests and captains, how he might betray him unto them.
He communed, talked, conferred with them.
Luke 22:5 And they were glad, and covenanted to give him money.
Used by satan? Because he loved money more than God. Satan tempted him through the sin of covetousness. Have we ever been tempted in some area? They, the chief priests and captains were glad to commune with satan. They followed the shadow of the law and missed the Light of God.
Luke 22:6 And he promised, and sought opportunity to betray him unto them in the absence of the multitude.
They sought the opportunity to betray Jesus in secret, when the crowds were not there. This was no accident, but a cold deliberate plotting. Judas would receive the judgment of death first. The chief priests continued the plot to deliver Jesus to Pilate, after the death of Judas. They were perhaps more guilty and had the greatersin.
John 19:10 Then saith Pilate unto him, Speakest thou not unto me? knowest thou not that I have power to crucify thee, and have power to release thee?
John 19:11 Jesus answered, Thou couldest have no power at all against me, except it were given thee from above: therefore he that delivered me unto thee hath the greater sin.
James 3:1 My brethren, be not many masters, knowing that we shall receive the greater condemnation.
They knew better.