Jerome of Stridon
These who “rejoice upon their beds” are spoken of as saints, as perfect men. What else do they have? “And two-edged swords in their hands” (Ps 149:6).
Two-edged swords: the swords of the saints are sharp on both sides. We read in the Revelation of John, which is read and received in the Church, for it is not among the apocrypha but among ecclesiastical writings, concerning the Lord Savior: “And from His mouth came a sharp two-edged sword.”
Thus you see that the saints received these two-edged swords, which they hold in their hands, from the mouth of the Lord.
That is, the Lord gives His disciples a sword from His mouth, a two-edged sword, meaning the word of His teaching.
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The two-edged sword is both historical and allegorical, both according to the letter and according to the spirit. It is a two-edged sword, striking adversaries and defending His own.
This two-edged sword is sharpened on both sides. John speaks both of the present age and of the age to come. Here it strikes adversaries, and above it opens the Kingdom of Heaven.