Parallel
Genesis 23:20
Rahlfs Septuagint (1935) · Berean Standard Bible
καὶ ἐκυρώθη ὁ ἀγρὸς καὶ τὸ σπήλαιον ὃ ἦν ἐν αὐτῷ τῷ Αβρααμ εἰς κτῆσιν τάφου παρὰ τῶν υἱῶν Χετ
So the field and its cave were deeded by the Hittites to Abraham as a burial site.