Leviticus 23:10; Leviticus 23:15

10 "Speak to the people of Israel and say to them, When you come into the land that I give you and reap its harvest, you shall bring the sheaf of the firstfruits of your harvest to the priest,

15 "You shall count seven full weeks from the day after the Sabbath, from the day that you brought the sheaf of the wave offering.