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vi'-per ('eph`eh (Job 20:16; Isaiah 30:6; 59:5); echidna (Matthew 3:7 = Luke 3:7; Matthew 12:34; 23:33; Acts 28:3)):
Several vipers are found in Palestine, but it is not certain that 'eph`eh referred definitely to any of them.
Orr, James, M.A., D.D. General Editor. "Entry for 'VIPER'". "International Standard Bible Encyclopedia". 1915.