In the southern section of the Court there were four gates (from west to east): the Upper Gate; the Gate of Kindling (through which the wood for the woodpile was brought in); the Gate of the Firstborn (through which the firstborn offerings were brought); and the Gate of Water, through which a flask of water for the libation performed during the Sukkot holiday was brought. (Source: Midot 1:4). 
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Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII