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.

9963. 'When they go into the tent of meeting' means in worship representative of all things of heaven and the Church. This is clear from the meaning of 'going into the tent of meeting' as worship representative of all things of heaven and the Church. For 'the tent' represented heaven where the Lord was, 9457, 9481, 9485, 9784, so that 'going into it', when it refers to Aaron and his sons, means worship of the Lord. Furthermore all the worship at that time took place within the tent and at the altar; for within the tent the loaves of the presence were laid out, the lamps were lit, and incense was offered, and at the altar sacrifice took place. These things primarily were the ones in which representative worship consisted. Representative worship is the outward performance of worship representing the inward virtues of love derived from the Lord and offered back to Him, thus all things of heaven and the Church; for in heaven and in the Church everything has connection with the good belonging to love and the truth belonging to faith which are derived from the Lord and offered to Him.