Omer (Bible)
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Omer is an ancient unit of measure used in the era of the Temple in Jerusalem. It is used in the Bible as an ancient unit of volume for grains and dry commodities. (The omer was equal to 0.1 ephah; this is believed to equal approx. 43 oz. 4.032 liters, 246.05 cubic inches, 0.9154 U.S.dry gallon, or 0.8869 British imperial gallon). The word omer is sometimes translated as sheaf — specifically, an amount of grain large enough to require bundling. An omer of barley was a traditional offering on the second day of Passover during the period of Temple sacrifice. Also, when God sent manna to the Israelites wandering in the desert, they were instructed to collect "an omer for each person in your tent".
In Judaism, the significance of the omer is the tradition of the Counting of the Omer (sefirat ha'omer), the forty-nine days between the second night of Passover and the night before Shavuot.