(Devarim 15:3) "Of the gentile shall you exact": This is a positive commandment. "and what you have with your brother (your hand shall release") and not what your brother has in your hand — whence it is derived that if someone lent on a pledge, shemitah does not release (the pledge). "and what you have with your brother your hand shall release": and not one who hands over his bills (of indebtedness) to beth-din (i.e., Beth-din may present the bills for him; for then it is not his hand, but their hand that is doing so.) It is for this reason, for the general welfare, that Beth-Hillel instituted the prozbul (a declaration before the beth-din authorizing them to claim one's bills). For he saw the people ceasing to lend one another and transgressing ( Ibid . 9) "Take heed unto yourself lest there be in your heart a thing of wickedness, etc." He, therefore, arose and instituted the prozbul . And this is the text of the prozbul : "I transfer to you, so and so, the judges, in this and this place, every debt owing me, that I may collect it whenever I wish." And the judges or the witnesses sign below.
Sifrei Devarim 113
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