THE FEAST OF PENTECOST

The Feast of Pentecost commemorates 50 Days from the day the first fruits of the Barley Harvest was waved before the Lord GOD. It was on this Day that GOD visited His People after their Exodus from Egypt and through Moses, brought the Law down from Mount Sinai. This earthshaking Day of Visitation, trembling, and betrothal is the birthday of the nation of Israel.
Moses brought down the Law for the nation. Because of sin 3,000 were death under the Law that Day.
The Old Covenant is the national Covenant between GOD and His covenant people, and so the nation was established. They agreed to follow Him in DEVOTION and OBEDIENCE.
There is a Jewish tradition that King David was born and died at Pentecost. In the first sermon of the apostle Peter, recorded in Acts 2: 14-39, he linked the life, death, and Ascension of Jesus to King David's death, burial, and hope of immortality.
The biblical narrative of Pentecost is recorded in the 2nd chapter of the Book of Acts. Present were about 120 followers of Christ (Acts 1), including the 12 Apostles (the 11 faithful disciples and Matthias who was Judas' replacement), his mother Mary, various other women disciples and his brothers.
Traditional interpretation holds that the Descent of the Holy Spirit took place in the Upper Room, or Cenacle, while celebrating the day of Pentecost (Shavuot). The Upper Room was first mentioned in Luke 22: 12-13 "And he shall show you a large upper room furnished: there make ready. And they went, and found as he had said unto them, and they made ready the passover." This Upper Room was to be the location of the Last Supper and the institution of Holy Communion. The nest mention of the Upper Room is in Acts 1, the continuation of the Luke narrative by the same writer.
Here the disciples and women wait and they gave themselves up to constant prayer: "And when they were come in, they went up into the Upper Room, where abode both Peter and James, and John, and Andrew, Philip, and Thomas, Bartholomew, and Matthew, James the son of Alphaeus, and Simon Zelotes, and Judas the brother of James. These all continue with one accord in prayer and supplication, with the women, and Mary the mother of Jesus, and with his brethren."
Then, in Acts 2: 1-2, "And when the day of Pentecost was fully come, they went all with one accord in one place. And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting."
"They" refers to the aforementioned disciples, including the women. The "place" referring to the same Upper Room where these persons had "continued with one accord in prayer and supplication."
In spite of past failures the nation of Israel will indeed be restored. The House of Judah will be saved and the throne of David in Judah will be established upon the earth under the Messiah. The lost sheep of the House of Israel will be found and brought back home to Israel again because of their sincere and righteous heart. The nation will be fully restored. Those being saved are bringing many companions with them. The nation will be reunited as spoken by the Apostle Paul.
The New Covenant is established soul by soul and silently in the gentle bonds of Love.