New King James Version
“For then I will restore to the peoples a pure language, That they all may call on the name of the LORD, To serve Him with one accord.

King James Bible
For then will I turn to the people a pure language, that they may all call upon the name of the LORD, to serve him with one consent.

American Standard Version
For then will I turn to the peoples of a pure language, that they may all call upon the name of Jehovah, to serve him with one consent.

Berean Study Bible
For then I will restore pure lips to the peoples, that all may call upon the name of the LORD and serve Him shoulder to shoulder.

Douay-Rheims Bible
Because then I will restore to the people a chosen lip, that all may call upon the name of the Lord, and may serve him with one shoulder.

English Revised Version
For then will I turn to the peoples a pure language, that they may all call upon the name of the LORD, to serve him with one consent.

World English Bible
For then I will purify the lips of the peoples, that they may all call on the name of Yahweh, to serve him shoulder to shoulder.

Young's Literal Translation
For then do I turn unto peoples a pure lip, To call all of them by the name of Jehovah, To serve Him with one shoulder.

Zephaniah 3:9 Additional Translations ...