NET
6 The Lord’s words are absolutely reliable. They are as untainted as silver purified in a furnace on the ground, where it is thoroughly refined.
Darby
6 The words of Jehovah are pure words, silver tried in the furnace of earth, purified seven times.
KJV
6 The words of the LORD [are] pure words: [as] silver tried in a furnace of earth, purified seven times.