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ושמעו לקולך. פרש"י שכבר סימן מסור בידם מיעקב ומיוסף שבלשון זה דפקוד יפקוד יהיו נגאלין. ויש מקשים שלא מצינו שאמר יעקב לשון זה דפקוד יפקוד ולמאי דפרש"י בפרשת ויחי ניחא: ושמעו לקולך, “they will listen (obey) to your voice.” According to Rashi, the Jews had already been given the code word with which their eventual redeemer would identify himself when both Yaakov and Joseph used the root word פקד in connection with the time of their redemption from slavery in Egypt. I explained this on Genesis 50,24 and 25. Some people raise the question that actually we have no record of Yaakov having said: פקוד יפקוד. According to my explanation on that verse the question has been answered satisfactorily.