Above the Gate of the Spark, which was also called Yechoniah Gate, was the loft of the Place of the Spark. According to one opinion, the Place of the Spark was named after the perpetual fire that was kept burning there, from which fire was taken in the event that the fire of the woodpile on the mizbeach was extinguished. This loft was one of three places guarded by the priests. (Source: Midot 1:1). 
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Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII