The word Pentecost is from the Greek word meaning fiftieth. It’s the fiftieth day after Jesus‘ death, when the Holy Spirit can to earth, as Jesus had promised (John 14:26) to comfort his followers and be their counselor (Acts 2).
Although the word Pentecost is only used in the New Testament, there was also a feast on that same day in the Old Testament. It was called “the feast of the harvest” or “the day of first fruits”(Exodus 23:16 and Numbers 28:26).
Key verse about Pentecost: When the day of Pentecost came, they were all together in one place (Acts 2:1, NIV)
A lifelong student of the Bible, Peter DeHaan, PhD, wrote the 1,000-page website ABibleADay.com to encourage people to explore the Bible. His main blog and many books urge Christians to push past the status quo and reconsider how they practice their faith in every area of their lives.