Feast of Weeks
Like Passover Pentecost, also known as Feast of Weeks, is celebrated during the springtime as described in Leviticus 23:15-21. This holiday does not fall on a particular date instead it is celebrated 50 days ( see Counting of the Omer ) after Passover. Which is around the sixth or seventh day of the Hebrew month of Sivan. It commemorates when God gave the Israelite's the Ten Commandments on Mt. Sinai.