Leviticus 23:3

The sabbath] see on Exodus 20:8.

5-8. Passover and Feast of Unleavened Bread. Passover, Pentecost, and Tabernacles were the three great annual festivals which followed the seasons of the year and the operations of agriculture. For the institution of the Passover see Exodus 12:1, and for the sacrifices proper to the Feast of Unleavened Bread see Numbers 28:16. These two parts of the double festival were quite distinct. The Passover was celebrated on the fourteenth day of Nisan beginning at sunset, and was followed by the Feast of Unleavened Bread, which lasted for seven days. Hence the name of the feast of unleavened bread is sometimes used to include both festivals, as in Luke 22:1.

9-14. The beginning of the grain harvest was celebrated during the Feast of Unleavened Bread, when a sheaf of new corn was waved before the Lord, as an acknowledgment of His bounty, and a consecration of the harvest to Him.