Leviticus 23:15
And let seven full weeks be numbered from the day after the Sabbath, the day when you give the grain for the wave offering;
Exodus 34:22
And you are to keep the feast of weeks when you get in the first-fruits of the grain, and the feast at the turn of the year when you take in the produce of your fields.
Leviticus 23:10-11
Say to the children of Israel, When you have come to the land which I will give you, and have got in the grain from its fields, take some of the first-fruits of the grain to the priest;
Leviticus 25:8
And let seven Sabbaths of years be numbered to you, seven times seven years; even the days of seven Sabbaths of years, that is forty-nine years;
Deuteronomy 16:9-10
Let seven weeks be numbered from the first day when the grain is cut.
Numbers 28:26
And at the time of the first-fruits, when you give an offering of new meal to the Lord at your feast of weeks, there is to be a holy meeting: you may do no field-work: