A very important observation -
In both the Old and New Testaments, the word law focuses on the commands and regulations of the Mosaic covenant. In most instances the word law does not refer to instruction in a general sense but concentrates on what God demands that his people do. In both the Old and New Testaments this is apparent, for verbs like "keep" and "do" are linked with the law.
Thomas Schreiner, 40 Questions About Christians and Biblical Law