Leviticus 23:15
And you shall count to you from the next day after the sabbath, from the day that you brought the sheaf of the wave offering; seven sabbaths shall be complete.
Exodus 34:22
And you shall observe the Feast of Weeks, of the first-fruits of wheat harvest, and the Feast of Ingathering at the year's end.
Leviticus 23:10-11
Speak to the sons of Israel and say to them, When you have come into the land which I give to you, and shall reap the harvest of it, then you shall bring a sheaf of the firstfruits of your harvest to the priest.
Leviticus 25:8
And you shall number seven sabbaths of years to you, seven times seven years. And the time of the seven sabbaths of years shall be forty-nine years to you.
Deuteronomy 16:9-10
You shall count seven weeks to yourselves. Begin to count the seven weeks from the time you began to put the sickle to the grain.
Numbers 28:26
And in the day of the first-fruits, when you bring a new food offering to Jehovah in your Feast of Weeks, you shall have a holy convocation. You shall do no laboring work.