Reference for Kiddushin 155:19

ר' אליעזר בן יעקב אומר גר תניא רבי שמעון בן יוחי אומר גיורת פחותה מבת שלש שנים ויום אחד כשרה לכהונה שנאמר (במדבר לא, יח) וכל הטף בנשים החיו לכם והלא פינחס היה עמהם ורבנן החיו לכם לעבדים ולשפחות

Then let [the union of] a High Priest with a widow prove it, for his formation was not in sin, yet his daughter is unfit.<span class="x" onmousemove="('comment',' As supra, 77a.');">²⁶</span> As for a High Priest and a widow, that is because his cohabitation was in sin! Then let a halal prove it.<span class="x" onmousemove="('comment',' When he marries and cohabits with the daughter of a Levite or an Israelite, there is no sin, and yet the halal's daughter is unfit.');">²⁷</span>

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