Leviticus 23:15
"'You shall count from the next day after the Sabbath, from the day that you brought the sheaf of the wave offering; seven Sabbaths shall be completed:
Exodus 34:22
You shall observe the feast of weeks with the first fruits of wheat harvest, and the feast of harvest at the year's end.
Leviticus 23:10-11
"Speak to the children of Israel, and tell them, 'When you have come into the land which I give to you, and shall reap its the harvest, then you shall bring the sheaf of the first fruits of your harvest to the priest:
Leviticus 25:8
"'You shall count off seven Sabbaths of years, seven times seven years; and there shall be to you the days of seven Sabbaths of years, even forty-nine years.
Deuteronomy 16:9-10
You shall count for yourselves seven weeks: from the time you begin to put the sickle to the standing grain you shall begin to number seven weeks.
Numbers 28:26
"'Also in the day of the first fruits, when you offer a new meal offering to the LORD in your feast of weeks, you shall have a holy convocation; you shall do no servile work;