Reference for Arakhin 55:20

ואי אשמעינן הני תרתי משום דהכא חיותא והכא חיותא אבל מטלטלין ליחרמינהו כולהו צריכי

And if [the Divine Law] had taugh us about these two, [I would have said: The reason in both these cases] is that each is vitally necessary, but as for movable property, let him be allowed to devote it all,' therefore it was necessary [to teach about that as well].

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