וַיִּשְׁתַּ֙חוּ֙ אַבְרָהָ֔ם לִפְנֵ֖י עַ֥ם הָאָֽרֶץ׃
И Авраам поклонился народу земли.
Rashbam on Genesis
וישתחו אברהם, to Efron before the assembled people.
Sforno on Genesis
Avraham bowed. He bowed to them to acknowledge that it was in their honor that Ephron consented.
Radak on Genesis
וישתחו, Avraham bowed to Efron in everybody’s presence.