Rashi interprets this pasuk in the sense that Yaakov Avinu was concerned that there should be no blemish on his descendants. Yaakov did not want to be saved from death at the hands of his brother, Eisav, only to have his offspring doomed to assimilation. The Jew has always concerned himself with his children’s future. The “future” to which Yaakov was referring was his children’s spiritual future. He certainly was anxious regarding their physical and financial security, but that was not his prime concern. The security of financial success was secondary to the Patriarch who was to build Klal Yisrael….
