After the death of Sarah, we have the introduction of Rebekah. He who is at all instructed in the ways of God recognizes in the latter the bride for the risen Son and Heir of all things, and this after the figure of the covenant of promise in Sarah has passed away.
Till the Jews had refused the fresh summons of God to own their Messiah, now risen and glorified, there could be fittingly no bringing in of the Gentiles, no formation of a heavenly bride, the body of a heavenly Christ.
W. Kelly