'Scum' in the Bible

Therefore, thus said the Lord Jehovah: Woe to the city of blood, A pot whose scum is in it, And its scum hath not come out of it, By piece of it, by piece of it bring it out, Not fallen on it hath a lot.

And cause it to stand on its coals empty, So that its brass is hot and burning, Melted hath been in its midst its uncleanness, Consumed is its scum.

With sorrows she hath wearied herself, And the abundance of her scum goeth not out of her, In the fire is her scum.