When Jacob had his famous dream, of a staircase leading to heaven, he named the place "Bethel," which is Hebrew for "the house of God."

That literal meaning is reflected in the spiritual meaning: The Writings tell us that "Bethel" represents the knowledge and understanding we can have about the Lord's divine love, the perfect love which He has for all of us, the perfect love which is His essence. When we know about the Lord's love and have some understanding of it, that gives it a "house" inside us, a way for it to grow inside us and affect our own loves.

In Genesis 28:17, Bethel signifies the Lord's kingdom in the lowermost order. (Arcana Coelestia 3720)

In Amos 3:14, Bethel signifies the divine good. (Arcana Coelestia 2832[10])

"Bethel" has the opposite sense later in the Old Testament, after Jeroboam set up golden calves there and made it a center of idol-worship. Then it represented worship springing from evil loves.

Oil -- typically olive oil -- symbolizes the good that comes from celestial love. Celestial love is love of the Lord, the highest and purest love we can have. The good of celestial love is the desire to be good springing from celestial love: Wanting to do the Lord's will because you love Him. That's not a state many reach, even in heaven, but it's a beautiful goal. This representation makes sense based on the idea that the sun -- the source of all natural light and heat, and thus all natural life -- represents the Lord, the source of all spiritual light, heat and life. Burning oil was the most pure fire available in Biblical times, thus the closest representation of the sun people could create.