Charles Ellicott Commentary Zephaniah 3:20

"At that time will I bring you in, and at that time will I gather you; for I will make you a name and a praise among all the peoples of the earth, when I bring back your captivity before your eyes, saith Jehovah." — Zephaniah 3:20 (ASV)

See Deuteronomy 30:3 and following.