Acts 2:1

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

Acts 20:16

for Paul thought it desirable to sail by Ephesus, so that he might not be made to spend time in Asia; for he hastened, if it was possible for him, to be the day of Pentecost at Jerusalem.

1 Corinthians 16:8

But I remain in Ephesus until Pentecost.

Exodus 23:16

and the feast of harvest, the first-fruits of thy labours which thou hast sown in the field, and the feast of in-gathering, at the end of the year, when thou gatherest in thy labours out of the field.

Exodus 34:22

And thou shalt observe the feast of weeks, of the first-fruits of wheat-harvest, And the feast of ingathering at the turn of the year.

Leviticus 23:15-21

And ye shall count from the morning after the sabbath, from the day that ye brought the sheaf of the wave-offering, seven weeks; they shall be complete;

Numbers 28:16-31

And in the first month, on the fourteenth day of the month, is the passover to Jehovah.

Deuteronomy 16:9-12

Seven weeks shalt thou count: from the beginning of putting the sickle into the corn shalt thou begin to count seven weeks.

2 Chronicles 5:13

it came to pass when the trumpeters and singers were as one, to make one voice to be heard in praising and thanking Jehovah; and when they lifted up their voice with trumpets, and cymbals, and instruments of music, and praised Jehovah: For he is good,

2 Chronicles 30:12

The hand of God was also upon Judah to give them one heart to do the commandment of the king and of the princes, by the word of Jehovah.

Psalm 133:1

{A Song of degrees. Of David.} Behold, how good and how pleasant it is for brethren to dwell together in unity!

Jeremiah 32:39

And I will give them one heart, and one way, that they may fear me all their days, for the good of them, and of their children after them.

Zephaniah 3:9

For then will I turn to the peoples a pure language, that they may all call upon the name of Jehovah, to serve him with one consent.

Acts 1:13-15

And when they were come into the city, they went up to the upper chamber, where were staying both Peter, and John, and James, and Andrew, Philip and Thomas, Bartholomew and Matthew, James son of Alphaeus, and Simon the zealot, and Jude the brother of James.

Acts 2:46

And every day, being constantly in the temple with one accord, and breaking bread in the house, they received their food with gladness and simplicity of heart,

Acts 4:24

And they, having heard it, lifted up their voice with one accord to God, and said, Lord, thou art the God who made the heaven and the earth and the sea, and all that is in them;

Acts 4:32

And the heart and soul of the multitude of those that had believed were one, and not one said that anything of what he possessed was his own, but all things were common to them;

Acts 5:12

And by the hands of the apostles were many signs and wonders done among the people; (and they were all with one accord in Solomon's porch,

Romans 15:6

that ye may with one accord, with one mouth, glorify the God and Father of our Lord Jesus Christ.

Philippians 1:27

Only conduct yourselves worthily of the glad tidings of the Christ, in order that whether coming and seeing you, or absent, I may hear of what concerns you, that ye stand firm in one spirit, with one soul, labouring together in the same conflict with the faith of the glad tidings;

Philippians 2:2

fulfil my joy, that ye may think the same thing, having the same love, joined in soul, thinking one thing;

Treasury of Scripture Knowledge

Bible References

The day

Acts 20:16
for Paul thought it desirable to sail by Ephesus, so that he might not be made to spend time in Asia; for he hastened, if it was possible for him, to be the day of Pentecost at Jerusalem.
Exodus 23:16
and the feast of harvest, the first-fruits of thy labours which thou hast sown in the field, and the feast of in-gathering, at the end of the year, when thou gatherest in thy labours out of the field.
Exodus 34:22
And thou shalt observe the feast of weeks, of the first-fruits of wheat-harvest, And the feast of ingathering at the turn of the year.
Leviticus 23:15
And ye shall count from the morning after the sabbath, from the day that ye brought the sheaf of the wave-offering, seven weeks; they shall be complete;
Numbers 28:16
And in the first month, on the fourteenth day of the month, is the passover to Jehovah.
Deuteronomy 16:9
Seven weeks shalt thou count: from the beginning of putting the sickle into the corn shalt thou begin to count seven weeks.
1 Corinthians 16:8
But I remain in Ephesus until Pentecost.

They

Acts 2:46
And every day, being constantly in the temple with one accord, and breaking bread in the house, they received their food with gladness and simplicity of heart,
Acts 1:13
And when they were come into the city, they went up to the upper chamber, where were staying both Peter, and John, and James, and Andrew, Philip and Thomas, Bartholomew and Matthew, James son of Alphaeus, and Simon the zealot, and Jude the brother of James.
Acts 4:24
And they, having heard it, lifted up their voice with one accord to God, and said, Lord, thou art the God who made the heaven and the earth and the sea, and all that is in them;
Acts 5:12
And by the hands of the apostles were many signs and wonders done among the people; (and they were all with one accord in Solomon's porch,
2 Chronicles 5:13
it came to pass when the trumpeters and singers were as one, to make one voice to be heard in praising and thanking Jehovah; and when they lifted up their voice with trumpets, and cymbals, and instruments of music, and praised Jehovah: For he is good,
2 Chronicles 30:12
The hand of God was also upon Judah to give them one heart to do the commandment of the king and of the princes, by the word of Jehovah.
Psalm 133:1
{A Song of degrees. Of David.} Behold, how good and how pleasant it is for brethren to dwell together in unity!
Jeremiah 32:39
And I will give them one heart, and one way, that they may fear me all their days, for the good of them, and of their children after them.
Zephaniah 3:9
For then will I turn to the peoples a pure language, that they may all call upon the name of Jehovah, to serve him with one consent.
Romans 15:6
that ye may with one accord, with one mouth, glorify the God and Father of our Lord Jesus Christ.
Philippians 1:27
Only conduct yourselves worthily of the glad tidings of the Christ, in order that whether coming and seeing you, or absent, I may hear of what concerns you, that ye stand firm in one spirit, with one soul, labouring together in the same conflict with the faith of the glad tidings;
Philippians 2:2
fulfil my joy, that ye may think the same thing, having the same love, joined in soul, thinking one thing;

General references

Exodus 36:10
And he coupled five of the curtains one to another, and the other five curtains coupled he one to another.
Leviticus 8:3
and gather all the assembly together at the entrance of the tent of meeting.
Leviticus 23:16
even unto the morning after the seventh sabbath shall ye count fifty days; and ye shall present a new oblation to Jehovah.
Deuteronomy 16:9
Seven weeks shalt thou count: from the beginning of putting the sickle into the corn shalt thou begin to count seven weeks.
Hebrews 13:1
Let brotherly love abide.