Reference for Keritot 28:36

וכן הבא על אם חמיו ועל אם חמותו

<big><b>GEMARA: </b></big>Said R'Eleazar in the name of R'Hoshaia: R'Johanan B'Nuri and Symmachus adhere to the same rule.<span class="x" onmousemove="('comment',' Viz., that if a manifold prohibition of the same denomination has been transgressed, several offerings are required.');">²¹</span>

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