Jamieson, Fausset and Brown on Revelation 13:14

14. deceiveth them that dwell on the earth--the earthly-minded, but not the elect. Even a miracle is not enough to warrant belief in a professed revelation unless that revelation be in harmony with God's already revealed will.

by the means of those miracles--rather as Greek, "on account of (because of; in consequence of) those miracles."

which he had power to do--Greek, "which were given him to do."

in the sight of the beast--"before him" (Re 13:12).

which--A, B, and C read, "who"; marking, perhaps, a personal Antichrist.

had--So B and Andreas read. But A, C, and Vulgate read, "hath."