Reference for Kiddushin 147:15

אמר רב יהודה

Shall we say, to certain with doubtful - but since the last clause states: R'ELEAZAR SAID: CERTAIN [UNFITS] ARE PERMITTED [TO INTERMARRY] WITH CERTAIN [UNFITS]; DOUBTFUL WITH CERTAIN, OR DOUBTFUL WITH DOUBTFUL, ARE FORBIDDEN, this proves that R'Judah does not hold thus. And should you answer: R'JUDAH FORBIDS IT refers to [the marriage of] a proselyte and a mamzereth, is it then taught, a proselyte with a mamzereth: ALL ARE FORBIDDEN TO ENTER INTO THE ASSEMBLY is taught!<span class="x" onmousemove="('comment',' V. supra 72a. And this does not include a proselyte.');">²¹</span> - Said Rab Judah,

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