Leviticus 23:13-16

¹³And the libations shall be offered with it, two tenths of hour tempered with oil for a burnt offering of the Lord, and a most sweet odour: libations also of wine, the fourth part of a hin.

¹⁴You shall not eat either bread, or parched corn, or frumenty of the harvest, until the day that you shall offer thereof to your God. It is a precept for ever throughout your generations, and all your dwellings.

¹⁵You shall count therefore from the morrow after the sabbath, wherein you offered the sheaf of the firstfruits, seven full weeks.

¹⁶Even unto the marrow after the seventh week be expired, that is to say, fifty days, and so you shall offer a new sacrifice to the Lord.