Passover and Sukkoth are seven days long, (Although Shemini Atzeret immediately follows Sukkoth, but Sukkoth itself is seven days), a man wraps tefillin (phylacteries) straps seven times around his arm, a woman waits seven days regarding laws of family purity, when the Jews left Egypt and went to conquer Jericho there were seven days each having seven circuits of the city sounding shofar till the wall fell, seven branches on the the menorah in the Temple, the Torah obligates Non-Jews in seven commandments, seven species which are the praise of the land of Israel, and many more sevens that appear in Judaism. 