'Letters' in the Bible

[and] asked for letters from him to the synagogues in Damascus, so that if he found any who were of the Way, both men and women, he could bring [them] tied up to Jerusalem.

as indeed the high priest and the whole council of elders can testify about me, from whom also I received letters to the brothers in Damascus, [and] was traveling [there] to lead away those who were there also tied up to Jerusalem so that they could be punished.

And they said to him, "We have received no letters about you from Judea, nor has any of the brothers come [and] reported or spoken anything evil about you.