פירוש על דברים 28:67

בבקר תאמר מי יתן ערב IN THE MORNING THOU SHALT SAY, WOULD IT WERE EVEN! — i.e. would that it were again yesterday evening,

מי יתן ערב, according to the plain meaning this refers to the following evening; this is the way the sick people react to their condition, assuming that they will start to get better by then.

That it were last evening. Rashi is answering the question: Logic would dictate the opposite [of what the verse says], because it says in Bava Basra (16b), “When the sun is high, illness is relieved,” which indicates that illness is worse in the evening than in the morning! Regarding this he explains, “That it were last evening.”