Charles Ellicott Commentary Genesis 35:14

"And Jacob set up a pillar in the place where he spake with him, a pillar of stone: and he poured out a drink-offering thereon, and poured oil thereon." — Genesis 35:14 (ASV)

Jacob set up a pillar. —In doing this Jacob was imitating his previous action when God manifested Himself to him in his journey to Haran (Genesis 28:18). This consecration of it by pouring on it oil, and offering to God a drink offering, was in itself natural and right. But as these memorial pillars were subsequently worshipped, they were expressly forbidden by the Mosaic Law, the word correctly rendered “pillar” in this place being translated standing image in Leviticus 26:1, and image in Deuteronomy 16:22.