How do we know we are given a pure language by God?

In Zephaniah 3:9, God declares, 'For then will I turn to the people of pure language, that they may all call upon the name of the Lord to serve Him with one consent.' This promise signifies a transformation among God's people, where they are equipped to worship Him truly and without the impurities of the flesh. In essence, the pure language represents the shared language of faith among believers, primarily focused on Jesus Christ, as Paul emphasizes in 1 Corinthians 2:2, choosing to know only Christ and Him crucified. This unity in worship is foundational for the Christian community.