Sefer HaMitzvot, Negative Commandments
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שהזהיר המלך מהרבות נשים. והוא אמרו לא ירבה לו נשים. וגבול זה שלא יוסיף על שמונה עשרה נשים בכתובה וקדושין. וכבר התבארו משפטי מצוה זו בשני מסנהדרין. (שם, שם):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That He prohibited the king from having many wives. And that is His saying, "he may not have many wives" (Deuteronomy 17:17). And the limit on this is that he not surpass eighteen wives with a contract (ketubah) and marriage (kiddushin). And the regulations of this commandment have already been explained in the second [chapter] of Sanhedrin. (See Parashat Shoftim; Mishneh Torah, Kings and Wars 3.)