'Letter' in the Bible

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?

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.

Do we then nullify the Law by this faith [making the Law of no effect, overthrowing it]? Certainly not! On the contrary, we confirm and establish and uphold the Law [since it convicts us all of sin, pointing to the need for salvation].

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.

I, Tertius, who penned this letter, greet you in the Lord.