Reference for Kiddushin 153:11

ואם נפשך לומר אמר קרא לא יחלל זרעו לא יחולל זה שהיה כשר ונתחלל

in sin; [therefore] Scripture saith, 'h shall not profane his seed:' this one shall not become profaned, who was [originally] fit and is [now] profaned. Our Rabbis taught: What is a halalah? One who was born of unfit persons.

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