Pentecost is the name of the New Testament and is the feast of God, which is recorded as the the feast of weeks in the Old Testament. It is the day when God poured the power of the Holy Spirit into the saints to prove Jesus Christ and spread the gospel of heaven to the whole world after Jesus ascended to the resurrection 2,000 years ago.
The Holy Spirit, which was given on Pentecost, became the powerful fuel for the development of the gospel of the first church.
Jesus made a new covenant on Passover, died on the cross the next day on the Feast of Unleavened Bread, and was resurrected as the "firstfruits of those who have fallen asleep" on the Day of Firstfruits. He ascended to heaven 40 days after his resurrection, and on the 50th day of Pentecost, he entered the Most Holy Place in heaven and poured the Holy Spirit into his disciples.

In this last age, we, like the early church members, should conduct a strong Holy Spirit movement as those who received the Holy Spirit. God gives the Holy Spirit as a gift according to what each of us needs. There are many gifts of the Holy Spirit, but one purpose of everything is to preach the gospel and save souls.
Let us give glory to God by bearing many fruits with the help of the Holy Spirit