TgJ Zec13:9 :וְאַצרוֹפִנוּן כְמָא דְצָרְפִין יָת כַספָא וְאַבחֲרִנוּן כְמָא דְבָחֲרִין יָת דַהבָא‏ : I shall refine him as they refine silver and assay him as they assay gold
See the entire entry for bḥr vb. to choose

TgJ Zec13:9 :אַצרוֹפִנֻון כְמָא דְצָרְפִין יָת כַספָא‏ : I shall refine them as they refine silver
See the entire entry for ṣrp vb. to refine; to tighten