Deuteronomy 16:9
"You shall count seven weeks. Begin to count the seven weeks from the time the sickle is first put to the standing grain.
Exodus 23:16
You shall keep the Feast of Harvest, of the firstfruits of your labor, of what you sow in the field. You shall keep the Feast of Ingathering at the end of the year, when you gather in from the field the fruit of your labor.
Exodus 34:22
You shall observe the Feast of Weeks, the firstfruits of wheat harvest, and the Feast of Ingathering at the year's end.
Acts 2:1
When the day of Pentecost arrived, they were all together in one place.
Leviticus 23:15-16
"You shall count seven full weeks from the day after the Sabbath, from the day that you brought the sheaf of the wave offering.
Numbers 28:26-30
"On the day of the firstfruits, when you offer a grain offering of new grain to the LORD at your Feast of Weeks, you shall have a holy convocation. You shall not do any ordinary work,
Deuteronomy 16:10
Then you shall keep the Feast of Weeks to the LORD your God with the tribute of a freewill offering from your hand, which you shall give as the LORD your God blesses you.
Deuteronomy 16:16
"Three times a year all your males shall appear before the LORD your God at the place that he will choose: at the Feast of Unleavened Bread, at the Feast of Weeks, and at the Feast of Booths. They shall not appear before the LORD empty-handed.
2 Chronicles 8:13
as the duty of each day required, offering according to the commandment of Moses 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.
1 Corinthians 16:8
But I will stay in Ephesus until Pentecost,
Hebrews 2:1
Therefore we must pay much closer attention to what we have heard, lest we drift away from it.