Jesus had promised to send the Holy Spirit. This happened while the believers were all together for the Feast of Pentecost.
When the Spirit came, there was a powerful wind and flames of fire appeared. The flames rested on each believer. This was the baptism with the Holy Spirit that Jesus had promised his disciples. It showed that the Spirit’s presence and power were with them.
The Spirit made it possible for them to speak other languages. These were languages the believers couldn’t speak before.
People from many different nations were there when this happened. Some of the people had been born Jews. Others were outsiders who had joined the Jewish people. All together they spoke many different languages. Yet they each heard and understood their own language being spoken. They were amazed.
A story in Genesis chapter 11 talks about people speaking in different languages. They couldn’t understand each other and had to stop working and living together. What happened at Pentecost was the exact opposite. People from many different places gathered and could understand one other. The Holy Spirit made this possible so that people could hear the good news about Jesus.