'Code' in the Bible

He has qualified us [making us sufficient] as ministers of a new covenant [of salvation through Christ], not of the letter [of a written code] but of the Spirit; for the letter [of the Law] kills [by revealing sin and demanding obedience], but the Spirit gives life.

If, however, the service that proclaims death--its code being engraved in writing upon stones--came with glory, so that the children of Israel could not look steadily on the face of Moses because of the brightness of his face--a vanishing brightness;