For the source text click/tap here: Yoma 13
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Just as they prepare a substitute Kohen for the High Priest, so they prepare a substitute wife for him - in the event that his wife will die. Since the Torah said, "He will atone for himself and his house (euphemism for wife)" - he must have one - this is the opinion of Rabbi Yehudah. The Sages, however, say that if so, they would have to prepare another wife, and another wife, and so on, to no end - therefore, conclude the Sages, they don't prepare a second wife for him.
Which leads us to struggle with the rabbinic notion of marriage and high office.