Leviticus 23:15-17
The Festival of Weeks
23:15 “‘You must count for yourselves seven weeks from the day after the Sabbath, from the day you bring the wave offering sheaf; they must be complete weeks.
23:16 You must count fifty days – until the day after the seventh Sabbath – and then you must present a new grain offering to the Lord.
23:17 From the places where you live you must bring two loaves of bread for a wave offering; they must be made from two tenths of an ephah of fine wheat flour, baked with yeast, as first fruits to the Lord.