Here "word of God" refers to anything that God has communicated to humanity whether through speech or through written messages. "the words of God are living"
This speaks about God's word as if it were alive. It means when God speaks, it is powerful and effective. (See: [[rc://en/ta/man/translate/figs-personification]])
A two-edged sword can easily cut through a person's flesh. God's word is very effective in showing what is in a person's heart and thoughts. (See: [[rc://en/ta/man/translate/figs-metaphor]])
This continues speaking about God's word as if it were a sword. Here the sword is so sharp that it can cut through and divide parts of the human that are very difficult or even impossible to divide. This means that there is nothing inside us that we can hide from God. (See: [[rc://en/ta/man/translate/figs-metaphor]])
# soul from spirit
These are two different but closely related nonphysical parts of a human. The "soul" is what causes a person to be alive. The "spirit" is the part of a person that causes him to be able to know and believe in God.
# joints from marrow
The "joint" is what holds two bones together. The "marrow" is the center part of the bone.
# It is able to know
This speaks about God's word as if it were a person who could know something. AT: "God's word exposes" (See: [[rc://en/ta/man/translate/figs-personification]])