מִצְרֵףmitsrêph

crucible, (properly place or instrument of refining) (Proverbs 17:3; Proverbs 27:21)

Pronunciation: mits-rafe' · Hebrew/Aramaic (Old Testament) · H4715

Same root

צָרַףtsâraph · H6884to fuse (metal), i.e. refine (literally or figuratively)

Where it appears

Appears 2 times in the Bible.

Proverbs 17:3 Fire tests the purity of silver and gold, but the Lord tests the heart.
Proverbs 27:21 Fire tests the purity of silver and gold, but a person is tested by being praised.

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).