Israeli citizens should carry a passport valid for half a year at least.
Former Israeli citizens take note: If you do not have a written authorization from the Israeli authorities abroad, attesting to your having waived your citizenship, you are required by law to enter and exit the country using your Israeli passports, and you are obliged to present exit permits from the IDF, if applicable.
Foreign citizens should carry a passport and the L17 form, handed to them upon their entry into the country.