When Does Counting the Omer begin asks Prof. Marvin A. Sweeney and Dr. Rabbi Zev Farber. The omer or “sheaf” offering takes place ממחרת השבת, “after the Shabbat” (Leviticus 23:15). Jewish interpreters have debated the exact meaning of this phrase for two millennia, resulting in… | Read More in The Blogs. Read More in Israel NOWlej.