The two-edged sword, cutting both ways (Ps 45:3, 5), striking some with conviction and conversion, and others with condemnation (Is 11:4; Rev 19:15), is in the mouth of Christ (Is 49:2), in the hand of His saints (Ps 149:6). Christ’s use of this sword in the temptation is our pattern as to how we are to wield it against Satan (Mt 4:4, 7, 10). There

Robert Jamieson, A. R. Fausset, and David Brown, Commentary Critical and Explanatory on the Whole Bible, vol. 2 (Oak Harbor, WA: Logos Research Systems, Inc., 1997), 358.

two-edged—sharpened at both edge and back. Compare “sword of the Spirit … word of God” (Eph 6:17). Its double power seems to be implied by its being “two-edged.” “It judges all that is in the heart, for there it passes through, at once punishing [unbelievers] and searching [both believers and unbelievers]” [CHRYSOSTOM]. PHILO similarly speaks of “God passing between the parts of Abraham’s sacrifices (Ge 15:17, where, however, it is a ‘burning lamp’ that passed between the pieces) with His word, which is the cutter of all things: which sword, being sharpened to the utmost keenness, never ceases to divide all sensible things, and even things not perceptible to sense or physically divisible, but perceptible and divisible by the word.” Paul’s early training, both in the Greek schools of Tarsus and the Hebrew schools at Jerusalem, accounts fully for his acquaintance with Philo’s modes of thought, which were sure to be current among learned Jews everywhere, though Philo himself belonged to Alexandria, not Jerusalem. Addressing Jews, he by the Spirit sanctions what was true in their current literature, as he similarly did in addressing Gentiles (Ac 17:28).

Robert Jamieson, A. R. Fausset, and David Brown, Commentary Critical and Explanatory on the Whole Bible, vol. 2 (Oak Harbor, WA: Logos Research Systems, Inc., 1997), 449.