Reference for Kiddushin 152:13

רבי יוסי אומר אף מי שהיה וכו' מאי טעמא דייקי ומחתמי

in his favour. R'Zera took trouble over them [sc. proselytes]; Rabbah B'Abbuhah took trouble over them. In the west [Palestine] not even an Inspector of Measures<span class="x" onmousemove="('comment',' Kori fr. kor, a measure.');">²⁸</span> was appointed of them.

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