The biblical episode of the manna describes God as instructing the Israelites to collect an omer for each person in your tent, implying that each person could eat an omer of manna a day.
Blessed are You, Lord our God, King of the Universe, who has sanctified us with His commandments, and commanded us concerning the counting of the Omer. Begin here if counting during daytime hours, or if you haven't counted every day since the beginning of this year's count: Today is twenty-five days, which is three weeks and four days of the Omer.
The Omer is a period of 49 days between the Jewish holidays of Passover and Shavuot. It is a mitzvah to ritually count each day, a practice known in Hebrew as sefirat ha’omer. The Omer is also a period of semi-mourning and many refrain from getting married or cutting their hair during this time.
The counting of the Omer, or Sefirat Ha’Omer in Hebrew, is a unique period in the Jewish calendar during which each day is counted with a blessing, from Passover to Shavuot.
Why Do We Count the Omer? From Manna to the Harvest in the Land
The omer was a daily portion of manna, signifying God's provision and sustenance for His people. The omer is also significant in the context of the Feast of Weeks, or Shavuot.
What is the Omer and why do we count it? The Omer was an ancient Hebrew measure of grain. Biblical law (Leviticus 23:9-11) forbade any use of the new barley crop until an ome r was brought as an offering to the Temple in Jerusalem.