John Gill Commentary Proverbs 30:5

"Every word of God is tried: He is a shield unto them that take refuge in him." — Proverbs 30:5 (ASV)

Every word of God [is] pure
The whole word of God. "All Scripture", given by inspiration of God, to which Agur directs, as giving the best account of God, of his name, nature, and perfections; of his Son, person, offices, and grace; being pure, very pure, "purified" ^F26 like silver, purified in a furnace of earth. The whole of Scripture is pure, free from all falsehood and error; coming from the God of truth, who cannot lie, and therefore called "the Scriptures of truth": every promise is pure as well as precious, made without dissimulation, faithfully performed, and all yea and amen in Christ; every doctrine is pure, free from the mixtures and inventions of men; the sincere milk of the word; consistent and all of a piece, not yea and nay; and tending to promote purity of heart and life; wholesome words, and doctrines according to godliness; see (Psalms 12:6) (18:30) (119:140) ;

he [is] a shield unto them that put their trust in him ;
not the word, but God, whose the word is; and which represents him as a proper object of trust, both with respect to things temporal and spiritual, at all times; and as a shield to protect such, by his power and grace, from all their enemies, sin, Satan, and the world, and also from all errors and false doctrines; see (Psalms 3:3) (5:12) (18:35) (Psalms 84:9Psalms 84:11Psalms 84:12) .

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FOOTNOTES:

• F26: (hpwru) "purgatus", Pagninus, Montanus, Tigurine version, Gejerus; "purgatissimus", Junius & Tremellius; Heb. "conflatus", Piscator, Mercerus, Cocceius, Schultens.