"Pentecost was a reversal of the judgment at the Tower of Babel when God confused man’s language (Gen. 11:1-9). God’s judgment at Babel scattered the people, but God’s blessings at Pentecost united the believers in the Spirit.
At Babel, the people were unable to understand each other, but at Pentecost, men heard God’s praises and understood what was said.
The Tower of Babel was a scheme designed to praise men and make a name for men, but Pentecost brought praise to God.
The building of Babel was an act of rebellion, but Pentecost was a ministry of humble submission to God. What a contrast! (Bible Exposition Commentary),
- Warren Wiersbe