The Torah states that God "did not dispel the pillar of cloud in the day, and the pillar of fire at night." The Mekhilta reads this verse carefully and discovers two teachings hidden in its structure.
The first teaching is about divine precision. Before the pillar of cloud had fully set in the evening, the pillar of fire had already risen. There was no gap between them — no moment when Israel was left without guidance. The transition from daytime cloud to nighttime fire was seamless, one overlapping the other to ensure continuous protection.
The second teaching is about Sabbath observance. The Mekhilta says this verse "comes to teach us proper deportment for Sabbath eve." Just as the pillar of fire was kindled before the pillar of cloud disappeared — ensuring light was present before darkness arrived — so too must Sabbath candles be lit before the daylight fades on Friday evening.
This connection between the wilderness pillars and Sabbath candle-lighting is remarkable. The rabbis saw in God's own behavior a model for Jewish practice. God did not wait for total darkness before providing fire. He anticipated the need. In the same way, a Jewish household should not wait until Friday night has fully arrived. The candles go up while it is still light — a smooth, graceful transition from the ordinary week into the holiness of Shabbat (the Sabbath), mirroring God's own seamless care for Israel in the desert.