Charles H. Spurgeon on Psalms 19:7

The law, or doctrine, an orderly manner of instruction, an institution or disposition, called in Hebrew torah, which implies both doctrine and an orderly disposition of the same. Therefore where one prophet, relating David's words, saith the law of man (2 Samuel 7:19), another saith, the orderly estate, or course of man. 1 Corinthians 17:17. The Holy Ghost, in Greek, calls it Nomos, a law (Hebrews 8:10), from Jeremiah 31:33. This name is most commonly ascribed to the precepts given by Moses at Mount Sinai (Deuteronomy 32:4; Malachi 4:4; John 1:17, and 7:19); it is also largely used for all his writings. For the history of Genesis is called law (Galatians 4:21), from Genesis 16. And though sometimes the law be distinguished from the Psalms and Prophets (Luke 16:16, and 24:24), yet the other prophets' books are called law (1 Corinthians 14:21), from Isaiah 28:11; the Psalms are also thus named (John 10:24 and 15:25), from Psalm 82:6 and 35:19. Yea, one Psalm is called a law (Psalm 78:1); and the many branches of Moses' doctrine as the law of the sin-offering, etc. Leviticus 6:25. And generally it is used for any doctrine, as the law of works, the law of faith, etc. Romans 3:27. —Henry Ainsworth.