## "Therefore" ##

"For that reason"

## this is the declaration of the Lord ##

"declares the Lord"

## I will take vengeance against my adversaries, and avenge myself against my enemies ##

Both of these phrases mean basically the same thing. Alternate translation: "I will punish those who opposed me." (See: [[rc://en/ta/man/translate/figs-parallelism]])

## I will turn my hand against you ##

Here "hand" refers to God's power which he would use to punish his people.  Alternate translation: "I will turn my power against you." (See: [[rc://en/ta/man/translate/figs-metonymy]])

## refine away your dross, and take away all of your impurities ##

This is what God would do.  God compared removing the sin from his people to using fire to remove dirt from silver.  Alternate translation: "and like fire removing the filth from silver, I will remove all the evil from among you." (See: [[rc://en/ta/man/translate/figs-metaphor]])