Leviticus 23:15
And ye shall count unto you from the day after the sabbath, from the day that ye offered the sheaf of the wave offering; seven sabbaths shall be complete;
Exodus 34:22
And thou shalt keep the feast of weeks, of the firstfruits of the reaping of the wheat, and the feast of ingathering at the year's end.
Leviticus 23:10-11
Speak unto the sons of Israel and say unto them, When ye have entered into the land which I give unto you and shall reap the harvest thereof, then ye shall bring a sheaf of the firstfruits of your harvest unto the priest;
Leviticus 25:8
And thou shalt number seven sabbaths of years unto thee, seven times seven years; and the space of the seven sabbaths of years shall be unto thee forty-nine years.
Deuteronomy 16:9-10
Seven weeks shalt thou number unto thee; begin to number the seven weeks from such time as thou shalt begin to put the sickle to the grain.
Numbers 28:26
Also in the day of the firstfruits, when ye offer a new present unto the LORD in your fulfilled weeks, ye shall have a holy convocation; ye shall do no servile work.