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6 And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.
'Three' denotes fullness, and 'a third,' not full.
(References: Arcana Coelestia 2788 [1-13])
5 All the country of Judea and all those of Jerusalem went out to him. They were baptized by him in the Jordan river, confessing their sins.