know - not in the Hebrew. Rather, understand the words by aposiopesis; it is usual in threats to leave the persons threatened to supply the hiatus from their own fears, owing to conscious guilt: “For I ... their works and thoughts,” etc.; namely, will punish [Maurer].
it shall come - the time is come that I will, etc. [Maurer].
gather ... nations - against Jerusalem, where the ungodly Jews shall perish; and then the Lord at last shall fight for Jerusalem against those nations: and the survivors (Isa 66:19) shall “see God’s glory” (Zec 12:8, Zec 12:9; Zec 14:1-3, Zec 14:9).
tongues - which have been many owing to sin, being confounded at Babel, but which shall again be one in Christ (Dan 7:14; Zep 3:9; Rev 7:9, Rev 7:10).