Thou shalt number unto thee seven weeks from that day, wherein thou didst put the sickle to the corn.

Deuteronomy 16:10,16 And thou shalt celebrate the festival of weeks to the Lord thy God, a voluntary oblation of thy hand, which thou shalt offer according to the blessing of the Lord thy God. . . .

Exodus 23:16 And the feast of the harvest of the firstfruits of thy work, whatsoever thou hast sown in the field. The feast also in the end of the year, when thou hast gathered in all thy corn out of the field.

Exodus 34:22 Thou shalt keep the feast of weeks with the firstfruits of the corn of thy wheat harvest, and the feast when the time of the year returneth that all things are laid in.

Leviticus 23:15,16 You shall count therefore from the morrow after the sabbath, wherein you offered the sheaf of firstfruits, seven full weeks. . . .

Numbers 28:26-30 The day also of firstfruits, when after the weeks are accomplished, you shall offer new fruits to the Lord, shall be venerable and holy: you shall do no servile work therein. . . .

2 Chronicles 8:13 That every day an offering might be made on it according to the ordinance of Moses, in the sabbaths, and on the new moons, and on the festival days three times a year, that is to say, in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles.

Acts 2:1 And when the days of the Pentecost were accomplished, they were all together in one place:

1 Corinthians 16:8 But I will tarry at Ephesus, until Pentecost.

Hebrews 2:1 Therefore ought we more diligently to observe the things which we have heard lest perhaps we should let them slip.