Reference for Arakhin 55:8

דתנו רבנן

THIS IS THE VIEW OF R'ELIEZER'R'ELEAZAR B. AZARYAH SAID: IF, EVEN TO THE HIGHEST, NO ONE IS PERMITTED TO DEVOTE ALL HIS POSSESSIONS, HOW MUCH MORE SHOULD ONE BE [CAREFUL ABOUT] SPARING IN REGARD TO ONE'S POSSESSIONS.

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