Verses with the word letter in the New Testament (10 verses):

Acts 23:25
And he wrote a letter after this manner:

Acts 23:34
And when the governor had read the letter, he asked of what province he was. And when he understood that he was of Cilicia;

Romans 2:27
And shall not uncircumcision which is by nature, if it fulfil the law, judge thee, who by the letter and circumcision dost transgress the law?

Romans 2:29
But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.

Romans 7:6
But now we are delivered from the law, that being dead wherein we were held; that we should serve in newness of spirit, and not in the oldness of the letter.

2 Corinthians 3:6
Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life.

2 Corinthians 7:8
For though I made you sorry with a letter, I do not repent, though I did repent: for I perceive that the same epistle hath made you sorry, though it were but for a season.

Galatians 6:11
Ye see how large a letter I have written unto you with mine own hand.

2 Thessalonians 2:2
That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand.

Hebrews 13:22
And I beseech you, brethren, suffer the word of exhortation: for I have written a letter unto you in few words.