The Bible

 

Genesis 1:6

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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.

The Bible

 

Psalms 136:7

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7 To him that made great lights: for his mercy endureth for ever:

Commentary

 

Third

  

'Three' denotes fullness, and 'a third,' not full.

(References: Arcana Coelestia 2788 [1-13])