In Judaism the Festival of Weeks ( "Shavuot") is a harvest festival that is celebrated seven weeks and one day after the first day of the Feast of Unleavened Bread in or seven weeks and one day after the Sabbath referred to in . The Festival of Weeks is also called the "feast of Harvest" in and the "day of first fruits" in . In it is called the "firstfruits of the wheat harvest." The date for the "Feast of Weeks" originally came the day after seven full weeks following the first harvest of grain. In Jewish tradition the fiftieth day was known as the "Festival of Weeks". The actual mention of fifty days comes from .