This Sunday/Monday is the Feast of Shavuot or Pentecost

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 Shavuot or Pentecost is the Feast of Weeks. You count 7 weeks and 1 day.

This was the day the Torah was given by God to Moses on Mt Sinai in Exodus.

It is also the exact same day a few thousand years later, when the Ruach HaKodesh the Holy Spirit was given in Acts chapter 2.

That is why there were so many gathered in Jerusalem. Shavuot was one of the 3 major Feasts that they were required to go back.

So the Torah and the Holy Spirit were given on the same day. Thatâ€s not a Coincidence.


Here is part of a long article from Hebrew4Christians that summarizes it


Here is the full article for anyone interested...https://hebrew4christians.com/Holidays/Spring_Holidays/Shavuot/shavuot.html

During Temple times, Shavuot was observed an agricultural festival, though the sages also recognized it as the time to commemorate the giving of the Torah at Mount Sinai. As one of the three pilgrimage festivals, Jews from all over the world would come to Jerusalem to celebrate and reaffirm their commitment to the covenant of Moses.

And such was the practice when God delivered the Substance of which the festival of Shavuot was merely a "type and a shadow." For the Brit Chadashah reveals that Shavuot is the climax of God's plan for our deliverance through Yeshua, the true Lamb of God (Seh Elohim). The countdown to Shavuot represents the giving of the anticipated New Covenant to mankind, since it was on this very day that the Ruach HaKodesh (Holy Spirit) was given to form the Church of God.


With a touch of divine irony, on the very day that Jews from around the world gathered in Jerusalem to reaffirm their commitment to the covenant of Moses, the Holy Spirit descended upon Israel to offer the promise of the New Covenant to all who will believe (see Acts 2:1-42). This new covenant makes Torah a matter of the heart, written by the God's Spirit, that yields a life fruitful in the praise of God.

Just as the resurrection of Yeshua represents the Firstfruits of those who have died (1 Cor 15:20) and fulfills the prophetic ritual of the waving of the omer on the festival of First Fruits, so the giving of the Holy Spirit to the church fulfills the wave offering of the wheat loaves on the day of Shavuot.

Shavuot marks the time when God entered into covenant with the Jewish nation. During the first Shavuot at Sinai, God instituted the Mosaic covenant and gave the Torah in written form, but during the Shavuot at Zion, after the resurrection of Yeshua, God established the New Covenant when He wrote the Torah on the hearts of Yeshua's followers. 

• Shavuot at Mount Sinai is sometimes considered the day on which Judaism was born.  Shavuot in Jerusalem (Mount Zion) is the day on which the church was born when the Holy Spirit was poured out upon the followers of the Mashiach.
  
  
• At Mount Sinai the Ten Commandments were written on tablets of stone by the "finger of God" (Exodus 31:18), but at Mount Zion, the Torah is written on tables of the heart by the Spirit of God (2 Cor 3:3; Hebrews 8:10). 
  
  
• Just as the Israelites were affirmed as God's chosen people on Shavuot with the giving of the Torah, so the Church was affirmed as God's chosen people at Shavuot after the Mashiach's ascension into heaven as the Mediator of a Better Covenant (Hebrews 8:6). The 3,000 that were added to the church that day were firstfruits of the redeemed people of God.
  
  
• In the Jewish tradition, Shavuot is compared to a wedding, for it was on Shavuot that the covenant between God and the Jewish People was sealed at Mount Sinai. The church is called Kallat Mashiach - the Bride of Messiah (Rev 21:2,9), and we eagerly await the marriage supper to come (Rev 19:9).