The festival of Pentecost takes place fifty days after Easter. and celebrates the coming of the Holy Spirit to the disciples. This is recorded in the Acts of the Apostles:

When the day of Pentecost came, they were all together in one place.

Suddenly a sound like the blowing of a violent wind came from heaven and filled the whole house where they were sitting.

They saw what seemed to be tongues of fire that separated and came to rest on each of them.

All of them were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them.

To read the whole story, reach for your Bible and find Acts chapter 2 starting at verse 1. Be amazed and delighted!