Sforno on Genesis 28:18/ספורנו על בראשית כ״ח:י״ח

1וישם אותה מצבה, he sanctified it as an altar which he would erect on his return from Charan. The Torah testifies in Genesis 35,14 that this is indeed what Yaakov did on his way home to the land of Canaan. ויצב יעקב מצבה במקום אשר דבר “Yaakov established an altar on the site where he had said.”