Albert Barnes on Matthew 26:4

By subtilty. By guile, deceit, or in some secret manner, so that the people would not know it. Jesus was regarded by the people as a distinguished prophet, and by most of them probably, as the Messiah; and the sanhedrim did not dare to take him away openly, lest the people should rise and rescue him. They were probably aware that he had gone out to Bethany, or to some of the places adjacent to the city; and as he passed his nights there, and not in the city, there was need of guile to ascertain the place where he remained, and to take him.

(v) "And consulted" Ps 2:2