Reference for Kiddushin 145:18

אמר רבא בר רב הונא מצאו מהול

But [you must answer that] it is rare: then here too,<span class="x" onmousemove="('comment',' With respect to a shethuki marrying an ordinary person.');">²⁰</span> it is rare!<span class="x" onmousemove="('comment',' Though the former is certainly unfit, while the latter is doubtful.');">¹</span> - But [the reason is:] a higher standard was set up in respect to genealogy. Raba also said: By Biblical law, a foundling is fit. What is the reason? A married woman ascribes [an illegitimate child] to her husband.<span class="x" onmousemove="('comment',' And would not cast him away.');">²²</span> What [fear] is there?<span class="x" onmousemove="('comment',' That the foundling may be mamzer?');">²³</span> [Because of] a minority of arusoth<span class="x" onmousemove="('comment',' Pl. of arusah.');">²⁴</span> and a minority whose husbands have gone overseas?<span class="x" onmousemove="('comment',' And the foundling may be theirs.');">²⁵</span> But since there are unmarried [women], and also [children thrown away] on account of poverty,<span class="x" onmousemove="('comment',' Lit., 'hunger,' - the child may be legitimately born. - The child of an unmarried woman is not mamzer.');">²⁶</span> it is half and half, and the Torah said: 'A mamzer shall not enter into the assembly of the Lord': only a certain mamzer may not enter, but a doubtful mamzer may; only into a certain assembly may he not enter, but he may enter into a doubtful one. Why then did they [the Rabbis] rule that a foundling is unfit? Lest he marry his paternal sister.<span class="x" onmousemove="('comment',' But there is no fear of his maternal sister, for since we know his intended mother-in-law as a virtuous woman, we do not suspect her of adultery and that this may be her son (Rashi) . Of course, the same might be urged of his intended father-in-law, but that it is easier for a man to conceal an illegitimate liaison than for a woman (Maharsha) .');">²⁷</span> If so, one foundling should not marry another, lest he marry his sister by his father or and his mother? - Do all these go throwing [their children away]!<span class="x" onmousemove="('comment',' Are we to assume all foundlings the children of the same mother or father!');">²⁸</span> Let him not marry the daughter of a foundling, lest he marry his sister? But [you must answer that] it is rare: then here too<span class="x" onmousemove="('comment',' With respect to a foundling marrying an ordinary person.');">²⁹</span> it is rare!<span class="x" onmousemove="('comment',' V. p. 374, n. 4.');">³⁰</span> - But [the reason is:] a higher standard was set up in respect to genealogy. Rabbah son of R'Huna said: If he [the foundling] is found circumcised,

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