I’m speaking my opinion but also having that opinion formed by the Church. It seems to me that the context of verses surrounding Hebrews 4:12 leads to the conclusion that “word of God” is not in this passage referring to scripture.
Certainly, in principle we can say that the Bible is powerful, living etc. because the scriptures are “the word of God” BUT in the context of this particular verse the Holy Scriptures are not in view.
MonFrere
Let’s take a closer look. I think the context shows the word of God is the
message preached to the people. In verse 12, the Greek is impersonal “it” not “he” which would be the case here if the word of God is personal as Jesus here. The antecedents of “word of God” is the message or “gospel preached.” The “faith we profess” in v.14 is the “gospel preached” in v.2,6 which is the “word of God” in v.12 that must be obeyed in v.11.
1Therefore, since the promise of entering his rest still stands, let us be careful that none of you be found to have fallen short of it. 2For we also have had **the gospel preached **to us, just as they did; but **the message they heard **was of no value to them, because those who heard did not combine it with faith. 3Now we who have believed enter that rest, just as God has said,
"So I declared on oath in my anger,
‘They shall never enter my rest.’ " And yet his work has been finished since the creation of the world. 4For somewhere he has
spoken about the seventh day in these words: “And on the seventh day God rested from all his work.” 5And again in the passage above he says, “They shall never enter my rest.”
6It still remains that some will enter that rest, and those who formerly had
the gospel preached to them did not go in, because of their disobedience. 7Therefore God again set a certain day, calling it Today, when a long time later he
spoke through David, as was said before:
“Today, if you
hear his voice,
do not harden your hearts.”[d] 8For if Joshua had given them rest, God would not have **spoken later **about another day. 9There remains, then, a Sabbath-rest for the people of God; 10for anyone who enters God’s rest also rests from his own work, just as God did from his. 11Let us, therefore, make every effort to enter that rest, so that no one will fall by following their example of disobedience. 12For
the word of God is living 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. 13Nothing in all creation is hidden from God’s sight. Everything is uncovered and laid bare before the eyes of him to whom we must give account. 14Therefore, since we have a great high priest who has gone through the heavens, Jesus the Son of God, let us hold firmly to
the faith we profess. 15For we do not have a high priest who is unable to sympathize with our weaknesses, but we have one who has been tempted in every way, just as we are—yet was without sin. 16Let us then approach the throne of grace with confidence, so that we may receive mercy and find grace to help us in our time of need.