Zephaniah 3:9 speaks of a pure language given to the peoples, which is echoed in Acts 2:4-11 where the Holy Spirit enables the apostles to speak in various tongues, symbolizing unity and the spread of the Gospel.
Zephaniah 3:11 speaks of the removal of pride and haughtiness, which is a theme also found in Isaiah 2:11 where the Lord humbles the proud and exalts the humble.
Zephaniah 3:19 speaks of God dealing with oppressors and gathering the outcast, which is echoed in Isaiah 61:1 where the anointed one brings good news to the oppressed and liberty to captives.