Hebrews 4:12-13

Amplified Bible

¹²For the word of God is living and active and full of power [making it operative, energizing, and effective]. It is sharper than any two-edged ^[a]sword, penetrating as far as the division of the ^[b]soul and spirit [the completeness of a person], and of both joints and marrow [the deepest parts of our nature], exposing and judging the very thoughts and intentions of the heart. ¹³And not a creature exists that is concealed from His sight, but all things are open and exposed, and revealed to the eyes of Him with whom we have to give account.

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Footnotes

Hebrews 4:12 In addition to “sword,” the word in Greek was used for the knife used by the priests to slit the throats of the sacrificial lambs and for the knife (scalpel) used by a surgeon.
Hebrews 4:12 “soul and spirit” used here to emphasize the whole person, not two separate entities as in other passages.