The words of the LORD [are] pure words: [as] silver tried in a furnace of earth, purified seven times.
Ver. 6. The words of the Lord are pure words] Free from all insincerity or falsehood; and not like those of Saul's flatterers, vile and vicious. All God's promises are infallible, and such as a man may write upon, as they say. They are yea and Amen, 2 Corinthians 1:20, that is, truth and assurance. God hath hitherto kept promise with nights and days, that they shall one succeed another, Jeremiah 33:20; Jeremiah 33:25, therefore much more will he keep promise with his people.
As silver tried in a furnace] In a sublimatory or crucible. The Greeks call it δοκιμιον, St Peter's word, 1 Peter 1:7 .
Purifed seven times] That is, sufficiently. Alchemy gold, as it will not pass the seventh fire, so it doth not comfort the heart, as true gold will.