Ein gemeiner Priester darf keine zum Gebären Unfähige heiraten, es sei denn, dass er bereits eine Frau oder Kinder hat. R. Jehuda sagt: auch wenn er bereits eine Frau oder Kinder hat, darf er eine zum Gebären Unfähige nicht heiraten, denn diese ist in der Thora (Lev. 21, 7) unter der „Unzüchtigen“ verstanden. Die Weisen aber sagen: „Unzüchtige“ heisst nur eine Proselytin, eine Freigelassene und eine solche, mit der man Unzucht getrieben hat.
English Explanation of Mishnah Sotah
An aylonit [who is incapable of giving birth], an old woman, and one who is unfit to bear children do not drink and do not receive the ketubah. Rabbi Eliezer says: he may marry another wife and be fruitful and multiply with her. The women listed in this section can all, by definition, not have children. An aylonit is a girl who never develops physical signs of maturity. By definition she cannot conceive. The old woman referred to here is one past child-bearing age. The woman who is unfit to bear children refers to one who drank a sterilizing potion. According to the first opinion in the mishnah, it is forbidden for a man to marry these types of women because they cannot bear children, and he is commanded to have children. Since this is a forbidden marriage, she does not drink the water. We should note that in Yevamoth 6:5 we learned that this prohibition only refers to someone who does not yet have children. A man who has children may marry a woman who cannot have children, since he has already performed his commandment. Rabbi Eliezer points out that this marriage too, while originally prohibited, may be maintained if he marries another woman with whom he can have children. Therefore, if she becomes a sotah she can drink the water.