 Mandelkern's greatest work is the "Heykhal ha-Ḳodesh," or "Veteris Testamenti Concordantiæ," a Hebrew-Latin concordance of the Hebrew and Chaldaic words found in the Bible (Leipsic, 1896), which almost superseded all similar works of that nature.An abridged edition of this monumental work appeared under the title "Tavnit Hekhal" (ib.1897; for the various criticisms which were made of Mandelkern in connection with the two editions of the concordance, and for lists of errata, see Bernhard Stade's "Zeitschrift," xviii.