"But Godspoketo this effect,that his DESCENDANTSWOULD BE ALIENSIN A FOREIGNLAND,AND THAT THEY WOULD BE ENSLAVEDAND MISTREATEDFOR FOUR HUNDREDYEARS.
[God] saidto Abram,"Knowfor certainthat your descendantswill be strangersin a landthat is not theirs,where they will be enslavedand oppressedfourhundredyears.
"Then in the fourthgenerationthey will returnhere,for the iniquityof the Amoriteis not yetcomplete."
"Therefore, comenow,and I will sendyou to Pharaoh,so that you may bringMy people,the sonsof Israel,out of Egypt."
What I am sayingis this:the Law,which camefour hundredand thirtyyearslater,does not invalidatea covenantpreviously ratifiedby God,soas to nullifythe promise.