Leviticus 23:16
“Even unto the morrow after the seventh sabbath shall ye number fifty days; and ye shall offer a new meat offering unto the Lord.”
And ye shall eat neither bread, nor parched corn, nor green ears, until the selfsame day that ye have brought an offering unto your God: it shall be a statute for ever throughout your generations in all your dwellings.
And ye shall count unto you from the morrow after the sabbath, from the day that ye brought the sheaf of the wave offering; seven sabbaths shall be complete:
Even unto the morrow after the seventh sabbath shall ye number fifty days; and ye shall offer a new meat offering unto the Lord.
Ye shall bring out of your habitations two wave loaves of two tenth deals: they shall be of fine flour; they shall be baken with leaven; they are the firstfruits unto the Lord.
And ye shall offer with the bread seven lambs without blemish of the first year, and one young bullock, and two rams: they shall be for a burnt offering unto the Lord, with their meat offering, and their drink offerings, even an offering made by fire, of sweet savour unto the Lord.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“In the third month, when the children of Israel were gone forth out of the land of Egypt, the same day came they into the wilderness of Sinai.”
“Three times thou shalt keep a feast unto me in the year.”
“Also in the day of the firstfruits, when ye bring a new meat offering unto the Lord, after your weeks be out, ye shall have an holy convocation; ye shall do no servile work:”
“And when the day of Pentecost was fully come, they were all with one accord in one place.”
“In the third month they began to lay the foundation of the heaps, and finished them in the seventh month.”