TSK · Isaiah 48:10

(for they are your people, and your inheritance, which you brought forth out of Egypt, from the midst of the furnace of iron);

"Surely there is a mine for silver, and a place for gold which they refine.

The refining pot is for silver, and the furnace for gold, but Yahweh tests the hearts.

Therefore thus says Yahweh of Armies, Behold, I will melt them, and try them; for how [else] should I do, because of the daughter of my people?

Son of man, the house of Israel is become dross to me: all of them are brass and tin and iron and lead, in the midst of the furnace; they are the dross of silver.

I will bring the third part into the fire, and will refine them as silver is refined, and will test them like gold is tested. They will call on my name, and I will hear them. I will say, 'It is my people;' and they will say, 'Yahweh is my God.'"

For they indeed, for a few days, punished us as seemed good to them; but he for our profit, that we may be partakers of his holiness.

Beloved, don't be astonished at the fiery trial which has come upon you, to test you, as though a strange thing happened to you.