Num 17:3

אֵ֡ת מַחְתּוֹת֩ הַֽחַטָּאִ֨ים הָאֵ֜לֶּה בְּנַפְשֹׁתָ֗ם וְעָשׂ֨וּ אֹתָ֜ם רִקֻּעֵ֤י פַחִים֙ צִפּ֣וּי לַמִּזְבֵּ֔חַ כִּֽי־הִקְרִיבֻ֥ם לִפְנֵֽי־יְהוָ֖ה וַיִּקְדָּ֑שׁוּ וְיִֽהְי֥וּ לְא֖וֹת לִבְנֵ֥י יִשְׂרָאֵֽל׃

As for the censers of those who sinned at the cost of their own lives, hammer them into sheets to overlay the altar, for these were presented before the LORD, and so have become holy. They will serve as a sign to the Israelites.”