'Letters' in the Bible

The Jews therefore marvelled, saying, How knoweth this man letters, having never learned?

and asked of him letters to Damascus unto the synagogues, that if he found any that were of the Way, whether men or women, he might bring them bound to Jerusalem.

As also the high priest doth bear me witness, and all the estate of the elders: from whom also I received letters unto the brethren, and journeyed to Damascus to bring them also that were there unto Jerusalem in bonds to be punished.

And they said unto him, We neither received letters from Judaea concerning thee, nor did any of the brethren come hither and report or speak any harm of thee.

And when I arrive, whomsoever ye shall approve, them will I send with letters to carry your bounty unto Jerusalem:

that I may not seem as if I would terrify you by my letters.

For, His letters, they say, are weighty and strong; but his bodily presence is weak, and his speech of no account.

Let such a one reckon this, that, what we are in word by letters when we are absent, such are we also in deed when we are present.

See with how large letters I write unto you with mine own hand.