What is weird is that you take three separate distinct prophetic words given to Abraham and set out to combine the first prophetic word with the third prophetic word.
Genesis 15:13-14 deals with God bringing the Israelites out of Egypt after being oppressed for 400 years: -
Genesis 15:13-14: - 13 Then He said to Abram: "Know certainly that your descendants will be strangers in a land that is not theirs, and will serve them, and they will afflict them four hundred years. 14 And also the nation whom they serve I will judge; afterward they shall come out with great possessions."
The God gives a personal prophecy to Abraham where He said to Abraham: -
Genesis 15:15: - 15 "Now as for you, you shall go to your fathers in peace; you shall be buried at a good old age."
The God gives Abraham assurance that some of his descendants will return to the Land of Canaan during the fourth age where God said the following: -
Genesis 15:16: - 16 But in the fourth generation/Age they shall return here, for the iniquity of the Amorites is not yet complete."
where "wə·ḏō·wr" is better understood to be an "Age," i.e. a little longer than 1,000 years.
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God in His covenant promises made to Jacob promised that even though He will cause Jacob descendants to be scattered to the four corners of the earth, that He would also gather them to Himself at the appointed time.
Genesis 28:13-15: - 13 And behold, the Lord stood above it and said: "
I am the Lord God of Abraham your father and the God of Isaac; the land on which you lie I will give to you and your descendants. 14 Also your descendants shall be as the dust of the earth; you shall spread abroad to the west and the east, to the north and the south; and in you and in your seed all the families of the earth shall be blessed. 15 Behold, I am with you and will keep you wherever you go, and will bring you back to this land/fertile soil; for I will not leave you until I have done what I have spoken to you."
Davy, it is only after 1948 AD that we are able to see that the previous understanding that you quoted was a load of bumkin/rubbish that the scholars produced in order to make some sense of Genesis 15:16 which was referencing a future distant time which was outside of their ability to comprehend. It was also outside of our recent scholars alibility to also comprehend.
Davy, you are right in saying that the explanation that you provided was given by a "
pretentious sage trying to present a false mystery."
Oh well so be it.