Bible Verses About Figurative Dross

Sonne of man, the house of Israel is vnto me as drosse: all they are brasse, and tinne, and yron, and leade in the mids of the fornace: they are euen the drosse of siluer.

Therefore, thus sayth the Lord God, Because ye are all as drosse, beholde, therefore I will gather you in the middes of Ierusalem.