“For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and spirit, of joints and marrow, and discerning the thoughts and intentions of the heart.”
Hebrews 4:12
Two-Edged Sword Etymology (from Wiktionary):
From the notion that if two sides of the same blade are sharp, it cuts both ways. The metaphor may have originated from the Arabic expression “sayf ḏū ḥadayn”, “double-edged sword”. In the Bible, the word of God is described as a being sharper than a double-edged sword.
The metaphor is first attested to in English in the 15th century. It is not to be confused with a double-ended sword.
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