This feast is also known as "Pentecost" (Acts 2:1) – meaning “fiftieth”. This feast was the first fruits of the wheat harvest. The one word that connects this feast is the word "Orientation". This feast is recorded in Leviticus chapter 23:15–21.
With this first fruits of the wheat harvest, Israel was to bring to 2 loaves of bread. This is the only feast were leavened bread was used. The two loaves represented Jew and Gentile – one in Messiah. It was the coming of the Ruach Hakodesh (Holy Spirit) that reinstated the renewed covenant. The separation between Jew and Gentiles has been broken down.