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God Wants Part of Penis Cut Off

Genesis 17:17, 20-22
Abraham fell on his face and laughed, thinking, ‘Can a son be born to a man who is 100? Can Sarah give birth to a child at 90?’ And God said, ‘As for Ishmael, I will make him into a large nation, but I will establish my pact with Isaac who Sarah will give birth to at this time next year.’