In my last post, I mentioned that the Hebrew jubilee was celebrated every 50 years because it followed seven cycles of sabbatical years (seven times seven). Another Jewish feast was calculated similarly: Leviticus describes the Festival of Weeks (Shavuot) as celebrated on the “day after the seventh Sabbath” (Leviticus 23:16). The “counting of the omer” would ritually count the days from Passover to Shavuot. An omer is a measure of unthreashed stalks of grain—the amount that was used in an offering at the temple. But the ritual of “counting of the omer” would count the days, often with a congregation after evening prayer.
Shavuot celebrates Moses receiving of the Torah on Mount Sinai. It is considered a time of covenant between God and humanity. Traditionally, Noah made his covenant with God on Shavuot. It is also the season of grain harvest, starting with barley around Passover and ending with wheat seven weeks later. When they had the temple, people would offer two loaves of leavened bread from the wheat harvest. It was also the beginning of the fruit harvest, and people would begin to bring their first fruits to the temple.