Following the Bnei Ches' offer, why did Avraham ask them to talk with Efron, and not talk to him personally?
Seforno and Ramban: Because Efron was a wealthy dignitary, and it is not correct for a person of such status to sell part of his inheritance. 1
Ohr ha'Chayim (9): Avraham was concerned lest they contest the sale in the future, saying that a neighbor had prior rights to buy it, or a creditor had a lien on it. He involved the entire city in the sale, so no one could protest later.
What are the connotations of "Im Yesh Es Nafshechem"?
Ohr ha'Chayim: (There are two ways to explain why you called me "Nesi Elokim"; refer to 23:6:1:6,7.) If you [esteem me, and] want [that I bury my dead, you will approach Efron.]
Malbim: (If I cannot acquire a family burial site, it is not proper burial.) If you want [that I can bury my dead properly, you will approach Efron, to decide the reason for the custom that only residents may have sites. 3
Why did Avraham specifically ask for Efron?
Ramban: Because he knew about the Me'aras ha'Machpeilah in the corner of Efron's property. 1 Moreover, it was not used as a burial plot, but was just part of his field.
Malbim: Efron was the judge, and could decide the reason for the custom (refer to 23:8:1.1:3*).
Why did Avraham essentially repeat "Likvor Es Mesi mi'Lefanai"?
Ha'Emek Davar: Aside from my honor, be concerned for my pain. I can remove myself from my Mes only like I say!