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20 and make my Sabbaths holy; and they shall be a sign between me and you, that you may know that I am Yahweh your God.
9 They have deeply corrupted themselves, as in the days of Gibeah. He will remember their iniquity. He will punish them for their sins.
'Three' denotes fullness, and 'a third,' not full.
(Reference: Arcana Coelestia 2788 [1-13])