Leviticus [Pertaining to Levites] 23:14-15

¹⁴You must not eat bread, or roasted grain, or fresh grain, until this same day, until you have brought the offering of your God. This is a regulation forever throughout all your generations in all your dwellings.

¹⁵“‘You shall count from the next day after the Sabbath, from the day that you brought the sheaf of the wave offering; seven Sabbaths shall be completed: