It certainly wasn’t the special day 13-year-old Nadav Elharar had in mind for his Bar Mitzvah. But the untimely death of his father, Nissim Elharar, who perished July 16 in a Hezbollah rocket attack while on the job at the Israel Railway train depot in Haifa, forced the family to cancel Bar Mitzvah preparations. A tearful Nadav — who four weeks ago cried over his father’s open grave, “Who will be by my side at my Bar Mitzvah?” — was escorted by a Chabad rabbi to his Bar Mitzvah at the Western Wall. Chabad provided his tefillin and underwrote a celebration lunch at a hotel near the Old City.