Deuteronomy 16:9

“You shall count seven weeks for yourself; you shall begin to count seven weeks from the time you first put the sickle to the standing grain.

Exodus 23:16

Also [you shall observe] the Feast of Harvest (Weeks, Pentecost, or First Fruits), acknowledging the first fruits of your labor, of what you sow in the field. And [third] the Feast of Ingathering (Booths or Tabernacles) at the end of the year when you gather in [the fruit of] your labors from the field.

Exodus 34:22

You shall observe and celebrate the Feast of Weeks (Harvest, First Fruits, or Pentecost), the first fruits of the wheat harvest, and the Feast of Ingathering (Booths or Tabernacles) at the year’s end.

Acts 2:1

When the day of Pentecost had come, they were all together in one place,

Leviticus 23:15-16

‘You shall count from the day after the Sabbath, from the day when you brought in the sheaf (tied bundle of grain) of the wave offering; there shall be seven complete Sabbaths (seven full weeks).

Numbers 28:26-30

‘Also on the day of the first fruits, when you offer a new grain offering to the Lord at your Feast of Weeks, you shall have a holy [summoned] assembly; you shall do no laborious work.

Deuteronomy 16:10

Then you shall celebrate the Feast of Weeks to the Lord your God with a tribute of a freewill offering from your hand, which you shall give [to Him] just as the Lord your God blesses you;

Deuteronomy 16:16

“Three times a year all your males shall appear before the Lord your God in the place which He chooses, at the Feast of Unleavened Bread (Passover) and at the Feast of Weeks (Pentecost) and at the Feast of Booths (Tabernacles), and they shall not appear before the Lord empty-handed.

2 Chronicles 8:13

a certain number every day, offering them up as Moses commanded for the Sabbaths, the New Moons, and the three annual feasts—the Feast of Unleavened Bread, the Feast of Weeks, and the Feast of Booths (Tabernacles).

1 Corinthians 16:8

But I will stay in Ephesus until Pentecost,

Hebrews 2:1

For this reason [that is, because of God’s final revelation in His Son Jesus and because of Jesus’ superiority to the angels] we must pay much closer attention than ever to the things that we have heard, so that we do not [in any way] drift away from truth.

Treasury of Scripture Knowledge

Summary

Seven weeks shalt thou number unto thee: begin to number the seven weeks from such time as thou beginnest to put the sickle to the corn.

Bible References

General references

Deuteronomy 16:10
Then you shall celebrate the Feast of Weeks to the Lord your God with a tribute of a freewill offering from your hand, which you shall give [to Him] just as the Lord your God blesses you;
Exodus 23:16
Also [you shall observe] the Feast of Harvest (Weeks, Pentecost, or First Fruits), acknowledging the first fruits of your labor, of what you sow in the field. And [third] the Feast of Ingathering (Booths or Tabernacles) at the end of the year when you gather in [the fruit of] your labors from the field.
Exodus 34:22
You shall observe and celebrate the Feast of Weeks (Harvest, First Fruits, or Pentecost), the first fruits of the wheat harvest, and the Feast of Ingathering (Booths or Tabernacles) at the year’s end.
Leviticus 23:15
‘You shall count from the day after the Sabbath, from the day when you brought in the sheaf (tied bundle of grain) of the wave offering; there shall be seven complete Sabbaths (seven full weeks).
Numbers 28:26
‘Also on the day of the first fruits, when you offer a new grain offering to the Lord at your Feast of Weeks, you shall have a holy [summoned] assembly; you shall do no laborious work.
2 Chronicles 8:13
a certain number every day, offering them up as Moses commanded for the Sabbaths, the New Moons, and the three annual feasts—the Feast of Unleavened Bread, the Feast of Weeks, and the Feast of Booths (Tabernacles).
Acts 2:1
When the day of Pentecost had come, they were all together in one place,
1 Corinthians 16:8
But I will stay in Ephesus until Pentecost,
Hebrews 2:1
For this reason [that is, because of God’s final revelation in His Son Jesus and because of Jesus’ superiority to the angels] we must pay much closer attention than ever to the things that we have heard, so that we do not [in any way] drift away from truth.