The words of the Lord] It is like he means the promise of the kingdom made to him, though it be true of all Gods word, Psalms 19:8. Proverbs 30:5.
pure words] Without drosse of falshood sticking to them, or mingled with it.
as silver tried in a furnace of earth] 2 Samuel 23:31. Psalms 18:30. and Psalms 119:140. Proverbs 30:5.
purified seven times] That is, many times, 1 Samuel 2:5. Proverbs 24:16. and Proverbs 26:25.