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.

Exodus 23:16

And the feast of harvest, the first fruits of your labors, which you sow in the field: and the feast of harvest, at the end of the year, when you gather in your labors out of the field.

Numbers 28:16-31

"'In the first month, on the fourteenth day of the month, is Yahweh's Passover.

Numbers 29:12-39

"'On the fifteenth day of the seventh month you shall have a holy convocation; you shall do no servile work, and you shall keep a feast to Yahweh seven days:

Deuteronomy 16:10-15

You shall keep the feast of weeks to Yahweh your God with a tribute of a freewill offering of your hand, which you shall give, according as Yahweh your God blesses you:

John 7:2

Now the feast of the Jews, the Feast of Booths, was at hand.

Acts 2:1

Now when the day of Pentecost had come, they were all with one accord in one place.

Treasury of Scripture Knowledge

Summary

And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year's end.

Bible References

Feast of weeks

Exodus 23:16
And the feast of harvest, the first fruits of your labors, which you sow in the field: and the feast of harvest, at the end of the year, when you gather in your labors out of the field.
Numbers 28:16
"'In the first month, on the fourteenth day of the month, is Yahweh's Passover.
Numbers 29:12
"'On the fifteenth day of the seventh month you shall have a holy convocation; you shall do no servile work, and you shall keep a feast to Yahweh seven days:
Deuteronomy 16:10
You shall keep the feast of weeks to Yahweh your God with a tribute of a freewill offering of your hand, which you shall give, according as Yahweh your God blesses you:
John 7:2
Now the feast of the Jews, the Feast of Booths, was at hand.
Acts 2:1
Now when the day of Pentecost had come, they were all with one accord in one place.

General references

Exodus 23:14
"You shall observe a feast to me three times a year.
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:
Deuteronomy 16:9
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.