That the “law of the LORD is perfect” refers to the absolute, complete, and entire trustworthiness of the Holy Scriptures. The Word of God is perfect in its accuracy and sure in its dependability. The Bible is unfailing as an absolutely trustworthy guide for our faith (belief in God) and practice (life and behavior).
This text goes on to describe the completeness of Scripture to meet our every need. It brings us salvation, wisdom, joy, insight, truth, and righteousness.
Whatever we may be facing today, let us look to God’s Word for guidance. It is a sure source we can rely on in times of need. This is so because God is true, because His Word reveals His truth, and because God cannot lie. Deuteronomy 7:9 confirms this: “Therefore know that the LORD your God, He is God, the faithful God who keeps covenant … with those who love Him and keep His commandments.”