Leviticus 23:15
And ye shall count from the morning after the sabbath, from the day that ye brought the sheaf of the wave-offering, seven weeks; they shall be complete;
Exodus 34:22
And thou shalt observe the feast of weeks, of the first-fruits of wheat-harvest, And the feast of ingathering at the turn of the year.
Leviticus 23:10-11
Speak unto the children of Israel and say unto them, When ye come into the land that I give unto you, and ye reap the harvest thereof, then ye shall bring a sheaf of the first-fruits of your harvest unto the priest.
Leviticus 25:8
And thou shalt count seven sabbaths of years, seven times seven years; so that the days of the seven sabbaths of years be unto thee forty-nine years.
Deuteronomy 16:9-10
Seven weeks shalt thou count: from the beginning of putting the sickle into the corn shalt thou begin to count seven weeks.
Numbers 28:26
And on the day of the first-fruits, when ye present a new oblation to Jehovah, after your weeks, ye shall have a holy convocation: no manner of servile work shall ye do.