Genesis 23:6

Attend to us, our lord. Great before the Lord art thou among us, in the best of our sepulchres bury thy dead: there is not a man of us who will refuse thee his sepulchre, that thou mayest bury thy dead.

נשיא אלוהים, “a prince of G’d,” neither stranger or resident stranger as Avraham had described himself.

במבחר קברנו קבור, “do not wait until the formalities of the purchase have been completed, but go ahead and bury Sarah.” This corresponds to a statement by our sages in Moed Katan 22 על כל המתים כולן מדחה מטתו, “it behooves us to bury all the dead with dispatch, without undue delay.”

שמענו אדני, this was said by their spokesman speaking on behalf of all of them. This is why he addressed Avraham as adoni in the singular mode, whereas the words following are all in the plural mode.

נשיא אלוהים, G’d has given you an elevated position, and we consider your status as such among us.

במבחר קברנו, they possessed many caves within which to bury the dead, and each family had such a cave reserved for interring its dead. Every corpse was buried in an individual coffin, the overall description of such a place being the word קבר, tomb. This is why the spokesman spoke of איש ממנו את קברו, he considered not the individual grave but the family’s burial grounds. They intended that Avraham should ask one of them to share their family plots with him.

The words לא יכלה in verse 6 mean that no one would withhold his burial plots from Avraham if the latter chose to use it. We come across this verb in a similar usage in Samuel I 25,33 אשר כליתני היום הזה מבא בדמים, ”for preventing me from seeking redress in blood.”