Acts 2:1

And when the day of Pentecost was fully come, they were all met together with one accord.

Acts 20:16

For Paul had determined to sail by Ephesus, that he might not spend time in Asia: for he endeavoured, if it were possible, to be at Jerusalem on the day of Pentecost.

1 Corinthians 16:8

But I shall stay at Ephesus till Pentecost. For a great and effectual door is opened to me,

Acts 1:13-15

And when they were come in to the city, they went up into an upper room, where Peter, and James, and John, and Andrew, Philip and Thomas, Bartholomew, and Matthew, James the son of Alpheus, and Simon the zealot, and Jude the brother of James, usually abode.

Acts 2:46

And continuing daily with one accord in the temple, and breaking bread from house to house, they partook of their food with gladness and simplicity of heart,

Acts 4:24

And when they heard it, they lifted up their voice to God with one accord, and said, Lord, Thou art God, who hast made heaven and earth, and sea, and all things therein:

Acts 4:32

And the heart and soul of the multitude that believed was one: no one called any of his possessions his own property, but they had all things common.

Acts 5:12

And by the hands of the apostles were many signs and wonders done among the people: And they all met with one accord in Solomon's portico:

Romans 15:6

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

Philippians 1:27

Only behave worthy of the gospel of Christ, that whether I come and see you, or be absent, I may hear of you, that ye stand firm in one Spirit, striving together as with one soul for the saith of the gospel;

Philippians 2:2

if any bowels of compassion, compleat ye my joy, be like-minded, maintaining the same love, with your souls united, in attending to the one thing needful.

Treasury of Scripture Knowledge

Summary

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

General references

Bible References

The day

Acts 20:16
For Paul had determined to sail by Ephesus, that he might not spend time in Asia: for he endeavoured, if it were possible, to be at Jerusalem on the day of Pentecost.
1 Corinthians 16:8
But I shall stay at Ephesus till Pentecost. For a great and effectual door is opened to me,

They

Acts 2:46
And continuing daily with one accord in the temple, and breaking bread from house to house, they partook of their food with gladness and simplicity of heart,
Acts 1:13
And when they were come in to the city, they went up into an upper room, where Peter, and James, and John, and Andrew, Philip and Thomas, Bartholomew, and Matthew, James the son of Alpheus, and Simon the zealot, and Jude the brother of James, usually abode.
Acts 4:24
And when they heard it, they lifted up their voice to God with one accord, and said, Lord, Thou art God, who hast made heaven and earth, and sea, and all things therein:
Acts 5:12
And by the hands of the apostles were many signs and wonders done among the people: And they all met with one accord in Solomon's portico:
Romans 15:6
that with one mind and one mouth ye may glorify the God and Father of our Lord Jesus Christ.
Philippians 1:27
Only behave worthy of the gospel of Christ, that whether I come and see you, or be absent, I may hear of you, that ye stand firm in one Spirit, striving together as with one soul for the saith of the gospel;
Philippians 2:2
if any bowels of compassion, compleat ye my joy, be like-minded, maintaining the same love, with your souls united, in attending to the one thing needful.

General references

Hebrews 13:1
Let brotherly love continue.