Reference for Kiddushin 145:13

אלא מעלה עשו ביוחסין

The majority are fit for her [sc. the mother],<span class="x" onmousemove="('comment',' I.e., who might be the child's father.');">¹⁴</span> while only a minority are unfit for her.<span class="x" onmousemove="('comment',' Since we know that the mother was unmarried, the only men whose issue is mamzer are mamzerim and consanguineous relations; for a heathen or slave does not produce mamzer. Thus only a minority are unfit in this respect.');">¹⁵</span>

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