The night Jesus was betrayed, he told his apostles:
“But I tell you the truth: It is for your good that I am going away. Unless I go away, the Counselor will not come to you; but if I go, I will send him to you. When he comes, he will convict the world of guilt in regard to sin and righteousness and judgment: in regard to sin, because men do not believe in me; in regard to righteousness, because I am going to the Father, where you can see me no longer; and in regard to judgment, because the prince of this world now stands condemned.” ~ John 16:7-11
Between Easter and Jesus’ Ascension:
He (Jesus) appeared to them (the apostles) over a period of forty days and spoke about the kingdom of God. On one occasion, while he was eating with them, he gave them this command: “Do not leave Jerusalem, but wait for the gift my Father promised, which you have heard me speak about. For John baptized with water, but in a few days you will be baptized with the Holy Spirit.” ~ Acts 1:3b-5
Pentecost is the Greek name for the Jewish feast day called the Feast of Harvest or the Feast of Weeks. After Jesus ascended into heaven, on the fiftieth day of that festival, God sent the promised “gift”: the Holy Spirit. We call this day “Pentecost”, which is Greek for “fifty”.
When the day of Pentecost came, they (the apostles) 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 [or languages] as the Spirit enabled them. ~ Acts 2:1-4
(Peter said to the crowd) “God has raised this Jesus to life, and we are all witnesses of the fact. Exalted to the right hand of God, he has received from the Father the promised Holy Spirit and has poured out what you now see and hear.” ~ Acts 2:32-33
The Holy Spirit and all believers:
And you also were included in Christ when you heard the word of truth, the gospel of your salvation. Having believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory... .. ..~ Ephesians 1:13-14
Living Hope Church 