Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
LXX

Ezekiel 21:19

And thou, son of man, prophesy, and clap thine hands, and take a second sword: the third sword is [the sword] of the slain, the great sword of the slain: and thou shalt strike them with amazement, lest the heart should faint

Read in other translations