After 49 days of preparation from Pesach Yetziat Mitzrayim/ Exodus on the seventh day of Sivan the feast of Shavuot Matan Torais celebrated. Shavuot, the Festival of Weeks, is the second of the three major festivals with both historical and agricultural significance. The other two are Passover and Sukkot.
Agriculturally, its the time when the first fruits were harvested and brought to the Temple, and is known as Hag ha-Bikkurim the Festival of the First Fruits.
Historically, it celebrates the giving of the Torah at Mount Sinai, and is also known as Hag Matan Torateinu, the Festival of the Giving of Our Torah. The giving of the Torah was a far-reaching spiritual event—one that touched the essence of the Jewish soul for all times. Sages have compared it to a wedding between God and the Jewish people. Customs include eating dairy foods and reading the Book of Ruth.
From the day after the Sabbath, the day you brought the sheaf of the wave offering, count off seven full weeks. Count off fifty days up to the day after the seventh Sabbath, and then present an offering of new grain to the Lord. From wherever you live, bring two loaves made of two-tenths of an ephah of fine flour, baked with yeast, as a wave offering of firstfruits to the Lord. Present with this bread seven male lambs, each a year old and without defect, one young bull and two rams. They will be a burnt offering to the Lord, together with their grain offerings and drink offerings—an offering made by fire, an aroma pleasing to the Lord. Then sacrifice one male goat for a sin offering and two lambs, each a year old, for a fellowship offering. The priest is to wave the two lambs before the Lord as a wave offering, together with the bread of the first fruits. They are a sacred offering to the Lord for the priest. On that same day you are to proclaim a sacred assembly and do no regular work. This is to be a lasting ordinance for the generations to come, wherever you live. When you reap the harvest of your land, do not reap to the very edges of your field or gather the gleanings of your harvest. Leave them for the poor and the alien. I am the Lord your God.Leviticus 23: 15-22