The answer is: Olive oil

Lev 24:2 - Pure olive oil was required to keep the lamps burning continually.

In Leviticus 24:2, the mention of pure olive oil for lighting the lamps in the Tabernacle underscores both practicality and symbolism in ancient worship. Olive oil was readily available in the region, making it the perfect choice for this sacred task. Not just an ordinary oil, it stood as a symbol of abundance and blessings from the land.

Did you know that olive trees were planted and cherished throughout Israel, often seen as a sign of prosperity? The imagery of oil in the Bible often goes hand in hand with the notion of anointing, representing God’s spirit and divine presence. In this sense, olive oil wasn’t just a fuel source; it embodied a spiritual light, illuminating the way for the Israelites while simultaneously symbolizing the presence of God among His people.

Interestingly, the act of daily maintenance of the lamps required the priests to show diligence, reflecting a spiritual discipline intended to maintain a connection with God. This mirrored the importance of habitual practice in developing a relationship with the divine, a theme prevalent in various religious contexts.

The unyielding light provided by the olive oil lamps was significant: it had to shine brightly at all times, it represented an ongoing relationship, highlighting the connection between heaven and earth. For believers today, the act of "lighting a lamp" for the soul can serve as a powerful metaphor for spiritual enlightenment that should remain constant, reminding us of an endless journey towards understanding and divine communion.