The special time each year when the Jews thank God for their food. They thank God for the start of the harvest. Pentecost comes 50 days after Passover. Also at this time Jews remember the time when God gave the Law to Moses. Christians remember that at Pentecost God gave his Holy Spirit to the church. See Acts 2. For Christians, Pentecost is 50 days after Easter. It is in May or June each year.