(Exodus, Ibid. 10) "he shall not diminish": R. Yoshiyah says: What is the intent of this? From (Ibid.) "If another (wife) he take for himself," I might think that this ("he shall not, etc.") refers to the Jewess (that he is taking); it is, therefore, written "he shall not diminish." With whom does "diminution" obtain? With one who has already been given something (i.e., the Hebrew maid-servant).)
Rabbi Yoshiyah Raises an Important Question About Who Exactly Is
Mekhilta Tractate Nezikin 3:26