Proverbs 25:4
Take away the dross from the silver, and a vessel shall come forth for the finer.
Proverbs 17:3
The fining pot is for silver, and the furnace for gold, but the LORD tries the hearts.
Isaiah 1:25-27
and I will turn my hand upon thee and according to pureness 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 clay, and likewise some to honour, and some to dishonour.
Ezekiel 22:18
Son of man, the house of Israel is to me become dross; they are all brass and tin and iron and lead in the midst of the furnace; they are become the dross of silver.
Malachi 3:2-3
But who may abide the time of his coming? and who shall stand when he appears? for he shall be like a refiner's fire and like fullers' soap:
1 Peter 1:7
that the trial of your faith, being much more precious than of gold (which perishes, nevertheless it is tried with fire), might be found unto praise and glory and honour when Jesus, the Christ, is made manifest;