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.

Exodus 23:16

And the feast of the grain-cutting, the first-fruits of your planted fields: and the feast at the start of the year, when you have got in all the fruit from your fields.

Numbers 28:16-31

And in the first month, on the fourteenth day of the month, is the Lord's Passover.

Numbers 29:12-39

And on the fifteenth day of the seventh month let there be a holy meeting; do no field-work, and keep a feast to the Lord for seven days;

Deuteronomy 16:10-15

Then keep the feast of weeks to the Lord your God, with an offering freely given to him from the wealth he has given you:

John 7:2

But the feast of the Jews, the feast of tents, was near.

Acts 2:1

And when the day of Pentecost was come, they were all together 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 the grain-cutting, the first-fruits of your planted fields: and the feast at the start of the year, when you have got in all the fruit from your fields.
Numbers 28:16
And in the first month, on the fourteenth day of the month, is the Lord's Passover.
Numbers 29:12
And on the fifteenth day of the seventh month let there be a holy meeting; do no field-work, and keep a feast to the Lord for seven days;
Deuteronomy 16:10
Then keep the feast of weeks to the Lord your God, with an offering freely given to him from the wealth he has given you:
John 7:2
But the feast of the Jews, the feast of tents, was near.
Acts 2:1
And when the day of Pentecost was come, they were all together in one place.

General references

Exodus 23:14
Three times in the year you are to keep a feast to me
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;
Deuteronomy 16:9
Let seven weeks be numbered from the first day when the grain is cut.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain