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:

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.

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

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 23:15-21

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 16:9-11

Let seven weeks be numbered from the first day when the grain is cut.

Numbers 28:18

On the first day there is to be a holy meeting: you may do no sort of field-work:

Acts 2:1-13

And when the day of Pentecost was come, they were all together in one place.

1 Corinthians 15:20

But now Christ has truly come back from the dead, the first-fruits of those who are sleeping.

James 1:18

Of his purpose he gave us being, by his true word, so that we might be, in a sense, the first-fruits of all the things which he had made.

Treasury of Scripture Knowledge

Summary

Also in the day of the firstfruits, when ye bring a new meat offering unto the LORD, after your weeks be out, ye shall have an holy convocation; ye shall do no servile work:

General references

Bible References

In the day

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.
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
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;
Deuteronomy 16:9
Let seven weeks be numbered from the first day when the grain is cut.
Acts 2:1
And when the day of Pentecost was come, they were all together in one place.
1 Corinthians 15:20
But now Christ has truly come back from the dead, the first-fruits of those who are sleeping.
James 1:18
Of his purpose he gave us being, by his true word, so that we might be, in a sense, the first-fruits of all the things which he had made.

General references

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