Proverbs 25:4
Take away the dross from the silver, and there shall come forth a vessel for the finer.
Proverbs 17:3
The fining-pot is for silver, and the furnace for gold: but the LORD trieth the hearts.
Isaiah 1:25-27
And I will turn my hand upon thee, and thoroughly purge away thy dross, and take away all thy tin:
2 Timothy 2:20-21
But in a great house there are not only vessels of gold and of silver, but also of wood and of earth; and some to honor, and some to dishonor.
Ezekiel 22:18
Son of man, the house of Israel is to me become dross: all they are brass, and tin, and iron, and lead, in the midst of the furnace; they are even the dross of silver.
Malachi 3:2-3
But who may abide the day of his coming? and who shall stand when he appeareth? for he is like a refiner's fire, and like fuller's soap.
1 Peter 1:7
That the trial of your faith, being much more precious than of gold that perisheth, though tried with fire, might be found to praise, and honor, and glory, at the appearing of Jesus Christ: