9“For at that time I will change the speech of the peoples to a pure speech, that all of them may call upon the name of the LORD and serve him with one accord.
The temporal adverb “at that time” (אז) refers back to the “day” of verse Zephaniah 3:8, thereby presenting yet another “day of the Lord” context for the words that follow in Zephaniah 3:9–13.
9 “For at that time I will change the speech of the peoples to a pure speech, that all of them may call upon the name of the LORD and serve him with one accord.