Leviticus 23:15-17

¹⁵And count to you, after the festival day, from the day that you brought the omera of the elevation, seven weeks, complete shall they be.

¹⁶Until the (day) after the seventh week number fifty days, and (then) offer a new mincha before the Lord.

¹⁷Bring from your dwellings two loaves for an elevation, two cakes, of two-tenths of flour shall they be, baked with leaven, as firstfruits before the Lord.