Kabbalah su I Re 18:38

As it is the nature of the blue light to demolish whatever comes into touch with it from beneath, therefore if the sacrifice be acceptable and the candle wholly kindled, then, as with Elijah, “the fire of the Lord descends and consumes the burnt-offering” {I Kings 18:38}, and this reveals that the chain is perfected, for then the blue light cleaves to the white light above, while at the same time consuming the fat and flesh of the burnt-offering beneath, nor can it consume what is below, except it rise and join itself to the white light. At such time, peace reigns in all worlds, and all together form a unity.