11. And when they heard it, they were glad, and promised to give him money--Matthew alone records the precise sum, because a remarkable and complicated prophecy, which he was afterwards to refer to, was fulfilled by it.
      And he sought how he might conveniently betray him--or, as more fully given in Luke (Lu 22:6), "And he promised, and sought opportunity to betray Him unto them in the absence of the multitude." That he should avoid an "uproar" or "riot" among the people, which probably was made an essential condition by the Jewish authorities, was thus assented to by the traitor; into whom, says Luke (Lu 22:3), "Satan entered," to put him upon this hellish deed.

JFB.