Or HaChaim on Genesis 35:7/אור החיים על בראשית ל״ה:ז׳

1 ויקראו למקום א־ל בית אל, He named the place El Bet El. Although Jacob had already named this place Bet El when he fled from Esau, he repeated naming the place El Bet El; he meant that G'd specifically associated His name with that site. The reason he thought so was that G'd had revealed Himself to him there. The reason he returned to this place was that G'd had meanwhile fulfilled the promise He made to Jacob at the time of his flight from Esau. The site had therefore assumed an even higher degree of sanctity in Jacob's eyes.