Proverbs 17:3

17:3 The crucible is for refining silver and the furnace is for gold,

likewise the Lord tests hearts.

Isaiah 31:9

31:9 They will surrender their stronghold because of fear;

their officers will be afraid of the Lord’s battle flag.”

This is what the Lord says –

the one whose fire is in Zion,

whose firepot is in Jerusalem.

Isaiah 48:10

48:10 Look, I have refined you, but not as silver;

I have purified you in the furnace of misery.