Acts 15:23

and they wrote by their hands as follows: The apostles, and the elders, and the brethren, to the brethren of the Gentiles in Antioch and Syria and Cilicia, greeting:

2 Corinthians 7:8

For although I caused you sorrow by my letter, I do not regret it, though I did regret it. For I see that the same letter gave you sorrow, though but for a short time.

Galatians 6:11

You see how long a letter I have written to you with my own hand.

Hebrews 13:22

I beseech you, brethren, bear with my word of exhortation: for I have written to you in few words.

Revelation 2:1-3

To the angel of the church in Ephesus, write: These things says he that holds the seven stars in his right hand, that walks in the midst of the seven golden candlesticks;

Treasury of Scripture Knowledge

Summary

Now these are the words of the letter that Jeremiah the prophet sent from Jerusalem unto the residue of the elders which were carried away captives, and to the priests, and to the prophets, and to all the people whom Nebuchadnezzar had carried away captive from Jerusalem to Babylon;

Bible References

Of the letter

Acts 15:23
and they wrote by their hands as follows: The apostles, and the elders, and the brethren, to the brethren of the Gentiles in Antioch and Syria and Cilicia, greeting:
2 Corinthians 7:8
For although I caused you sorrow by my letter, I do not regret it, though I did regret it. For I see that the same letter gave you sorrow, though but for a short time.
Galatians 6:11
You see how long a letter I have written to you with my own hand.
Hebrews 13:22
I beseech you, brethren, bear with my word of exhortation: for I have written to you in few words.