ויכלו המים. פירש"י לפי שדרך חולים לשתות הרבה. ותימ' דאמרי' במציעא דעד יעקב אבינו לא הוה חולשא. י"ל דעד יעקב לא חלה אדם מעצמו. אך זה לא חלה אלא מחמת שרה שהכניסה בו עין הרע: ויכלו המים, “the water was used up;” Rashi adds that it is the custom of sick people to drink a lot of water, so that the water was not used up as it had been insufficient for the journey to start with. This interpretation is somewhat puzzling, as we have been told in the Talmud, tractate Baba metzia, folio 87, that prior to the report in the Torah about Yaakov falling sick shortly before his death, sickness as we know it did not exist. We would have to conclude therefore that what the Talmud meant that until Yaakov fell sick, for no visible cause, no one fell sick without visible cause. Yishmael’s “sickness” was not a sickness in the accepted meaning of the word but was the result of Sarah having used the “evil eye” to cause this.