Related for Yevamot 122:1
ויש לו בנים לא ישא אילונית שהיא זונה האמורה בתורה דאזונה כהנים הוא דמפקדי וישראל לא מפקדי משום הכי קתני כהן
AND CHILDREN HE SHALL NOT MARRY A WOMAN INCAPABLE OF PROCREATION, SINCE SUCH [IS INCLUDED IN THE TERM OF] HARLOT MENTIONED IN THE TORAH. Since priests only were commanded concerning the harlot while Israelites were not so commanded, therefore PRIEST only was mentioned. Said R. Huna: What is R. Judah's reason? — Since it is written, And they shall eat, and not have enough, they shall commit harlotry and shall not increase,<span class="x" onmousemove="('comment',' Hos. IV, 10. ');"><sup>1</sup></span> any cohabitation which results in no increase is nothing but meretricious intercourse.
Tosefta Yevamot
...Rabbi Natan said: Beit Shammai say two boys [to fulfill pru urvu], like Moshe’s sons, as it is written: “And Moshe’s sons were Gershom and Elazar" (Chronicles 1 23:15). Beit Hillel say: a son and a daughter, as it is written: “Male and female God created them” (Genesis 5:2). Rabbi Natan said: Beit Shammai say: a son and a daughter, and Beit Hillel say: a son or a daughter....
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