'Refined' in the Bible

His feet were like burnished [white-hot] bronze, refined in a furnace, and His voice was [powerful] like the sound of many waters.

I counsel you to buy from Me gold that has been heated red hot and refined by fire so that you may become truly rich; and white clothes [representing righteousness] to clothe yourself so that the shame of your nakedness will not be seen; and healing salve to put on your eyes so that you may see.