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This man instituted the "prosbul" procedure to allow the wealthy to lend money safely. "Light and heavy" and "equivalence of expressions" are two of the group of arguments he labeled legitimate lines of interpretation. The question "If not now, when?" epitomizes this man's compassion, which led him to debate his stricter rival, (*) Shammai. This man established his namesake "seven rules" for interpreting Scripture. While standing on one foot, this man once told a Gentile that the statement "That which is hateful to you, do not do to your fellow" summarized the entire Torah. For 10 points, name this first century Rabbi in whose memory Jews eat a matzah sandwich on Passover.
This man instituted the "prosbul" procedure to allow the wealthy to lend money safely.
Rabbi Hillel the Elder