'Refine' in the Bible

"There are still too many soldiers," the LORD told Gideon. "Bring them down to the water and I'll refine them for you there. Therefore when I say to you, "This one will be going with you,' he'll go with you, but no one may go about whom I tell you, "This one won't be going with you.'"

Surely there is for silver a source, And a place for the gold they refine;

When He doth diminish droppings of the waters, They refine rain according to its vapour,

When you probe my heart, and examine me at night; when you refine me, you will find nothing wrong, for I have determined that I will not transgress with my mouth.

When I turn my attention to you, I'll refine your dross as in a furnace. I'll remove all your alloy.

Therefore, this is what the Lord of Hosts says:I am about to refine them and test them,for what else can I dobecause of My dear people?

Some of those who have insight will fall, in order to refine, purge and make them pure until the end time; because it is still to come at the appointed time.

And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The LORD is my God.

He will be like a refiner and purifier of silver; He will purify the sons of Levi and refine them like gold and silver. Then they will present offerings to the Lord in righteousness.