The Bible Project: Letter to the Hebrews
For the word of God is alive and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart.
-Hebrews 4:12
If you wish to purchase the Bible (KJV) and read the Letters to the Hebrews in detail you may use my link here.