 His first work was "Melecheth Shamayim" (מלאכת שמים - The Work of the Heavens, Altona, 1853, a reference to the Babylonian Talmud, Eruvin 13a) on the laws pertaining to Torah scrolls, tefillin (phylacteries) and mezuzot (door scrolls).A work first published in 1858 titled "Amirah le-Beth Ya'akov" (אמירה לבית יעקב - Words to the House of Jacob, a reference to Exodus 19