Leviticus 23:14-15

¹⁴'And bread and roasted corn and full ears ye do not eat until this self-same day, until your bringing in the offering of your God — a statute age-during to your generations, in all your dwellings.

¹⁵'And ye have numbered to you from the morrow of the sabbath, from the day of your bringing in the sheaf of the wave-offering: they are seven perfect sabbaths;