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על חלומותיו. וא"ת והלא עדיין לא סיפר להם כי אם חלום אחד. י"ל שנכתב המקרא על שם העתיד לספר להם חלום אחר. אי נמי בשביל שספרו להם תמיד כתב חלומותיו: על חלומותיו, “on account of his dreams.” If you were to ask that thus far Joseph has been reported as telling his brothers the content of only a single dream, so why does the Torah speak of “dreams” in the plural mode? We must answer that the Torah already referred also to events in the future. Alternately, Joseph had been in the habit of telling his brothers about his dreams, but it was only the ones in which he appeared as placing himself above his brothers that they hated him for.