Reference for Gittin 23:4

שאם ירצה שלא לזון כו': שמעת מינה יכול הרב לומר לעבד עשה עמי ואיני זנך

we likewise must suppose that the husband says to her: Keep what you can earn as the equivalent of your maintenance. [But if this is so] why, in the case of the wife should he not [be permitted to refuse to maintain her]? — Because she cannot earn enough [for her keep]. But a slave too may not be able to earn enough for his keep? — If a slave's [work] is not worth the food he eats, what do his master and mistress want him for!

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