Genesis 23:20

20 So the field and the cave in it were deeded to Abraham by the Hittites as a burial site.

Read Genesis 23:20 Using Other Translations

And the field, and the cave that is therein, were made sure unto Abraham for a possession of a buryingplace by the sons of Heth.
The field and the cave that is in it were made over to Abraham as property for a burying place by the Hittites.
So the field and the cave were transferred from the Hittites to Abraham for use as a permanent burial place.

What does Genesis 23:20 mean?

John Gill's Exposition of the Bible
Genesis 23:20

And the field, and the cave that is therein, was made sure to
Abraham for a possession of a buryingplace, by the sons of Heth.
] Who were witnesses of the transaction between Abraham and Ephron; and this was further made sure by Sarah's being buried in it, which was taking possession of it, for the use for which it was bought; and was a pledge and earnest of the future possession of the land of Canaan by the seed of Abraham: this was the first piece of ground in it possessed by Abraham and his seed; and it being called the possession of a buryingplace, shows that there is no contradiction between this and what Stephen says, ( Acts 7:5 ) ; he had a possession to bury in, but not to live upon; not any ground of his own to till and sow, or build upon.

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