John Gill's Bible Commentary Ver. 6. Add thou not unto his words , etc.] To the words of God; as the Jews did, by joining their oral law, or the traditions of the elders, to the written word, and preferring them before it; and as the Papists, by making their unwritten traditions, and the sense and determinations of their church, equal to the Scriptures; and as all enthusiasts do, who set up their pretended dreams, visions, revelations, and prophecies, upon a foot with the word of God, or as superior to it; whereas that is, and that only, the rule and standard of faith and practice, and is a sufficient and perfect one; (see Deuteronomy 4:2); lest he reprove thee ; that is, God; either by words or by blows, by threatenings and denunciations of his wrath and displeasure; or by chastisements and corrections for such daring pride, blasphemy, and wickedness; those who add to his words, he threatens to add plagues unto them, ( Revelation 22:18); and thou be found a liar ; a forger, speaker, and spreader of doctrinal lies, such doctrines as are contrary to the word of truth; not being built on that, but upon human inventions, and additions to it.
Matthew Henry Commentary
Verses 1-6 - Agur speaks of himself as wanting a righteousness, and having done very foolishly. And it becomes us all to have low thoughts of ourselves. He speaks of himself as wanting revelation to guide him in the ways of truth and wisdom. The more enlightened people are, the more they lamen their ignorance; the more they pray for clearer, still cleare discoveries of God, and his rich grace in Christ Jesus. In very.#(4) there is a prophetic notice of Him who came down from heaven to be ou Instructor and Saviour, and then ascended into heaven to be ou Advocate. The Messiah is here spoken of as a Person distinct from the Father, but his name as yet secret. The great Redeemer, in the glorie of his providence and grace, cannot be found out to perfection. Had it not been for Christ, the foundations of the earth had sunk under the load of the curse upon the ground, for man's sin. Who, and what is the mighty One that doeth all this? There is not the least ground to suspect anything wanting in the word of God; adding to his words open the way to errors and corruptions.
Original Hebrew אל408 תוסף3254 על5921 דבריו1697 פן6435 יוכיח3198 בך ונכזבת׃3576