Albert Barnes on Luke 22:4

Chief priests and captains. Mt 26:14. See the account of the bargain which Judas made with them explained in Mt 26:14 Mt 26:15 Mt 26:16 Barnes "Mr 14:10" Mk 14:11.

Absence of the multitude. The multitude, the people, were then favourable to Jesus. He had preached in the temple, and many of them believed that he was the Messiah. It was a hazardous thing, therefore, to take him by force, and in their presence, as they might rise and rescue him. Hence they sought to take him when he was away from the multitude; and as Judas,knew of a place where he could be found alone, they were glad of the opportunity of so easily securing him.