כִּֽי־בְחַנְתָּ֥נוּ אֱלֹהִ֑ים צְ֝רַפְתָּ֗נוּ כִּצְרָף־כָּֽסֶף׃
Pois tu, ó Deus, nos tens provado; tens nos refinado como se refina a prata.
Rashi on Psalms
You refined us to remove the dross from us when we repent before You, as they refine silver to remove its dross.