Jamieson, Fausset and Brown on Revelation 13:10

10. He that leadeth into captivity--A, B, C, and Vulgate read, "if any one (be) for captivity."

shall go into captivity--Greek present, "goeth into captivity." Compare Jr 15:2, which is alluded to here. Aleph, B, and C read simply, "he goeth away," and omit "into captivity." But A and Vulgate support the words.

he that killeth with the sword, must be killed with the sword--So B and C read. But A reads, "if any (is for) being (literally, 'to be') killed with the sword." As of old, so now, those to be persecuted by the beast in various ways, have their trials severally appointed them by God's fixed counsel. English Version is quite a different sense, namely, a warning to the persecutors that they shall be punished with retribution in kind.

Here--"Herein": in bearing their appointed sufferings lies the patient endurance ... of the saints. This is to be the motto and watchword of the elect during the period of the world kingdom. As the first beast is to be met by patience and faith (Re 13:10), the second beast must be opposed by true wisdom (Re 13:18).