Ketzos HaChoshen

The Ketzos HaChoshen is a major writing by Aryeh Leib Heller and the origin of his nickname, "the Ketzos". Its first printing was in Lviv.

Importance

The Ketzos HaChoshen is a halakhic work that explains difficult passages in the Shulchan Aruch, Choshen Mishpat with novel ideas proposed by Aryeh Leib. Familiarity with this work is considered mandatory for any Torah scholar or Dayan. It is customarily studied in conjunction with the Nesivos HaMishpat of Yaakov Lorberbaum, who often controverted Heller's conclusions on many points.
The Ketzos's sefer is often published in tandem with his brother Yehuda [Heller Kahana]'s book, Kuntras HaSfeikos, as a two-volume set.