Hebrews 4:12

For 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.

the word of God
Isaiah 40:8 The grass withers and the flowers fall, but the word of our God stands forever.
Luke 11:28 He replied, "Blessed rather are those who hear the word of God and obey it."
Acts 12:24 But the word of God continued to increase and spread.
1 Thessalonians 2:13 And we also thank God continually because, when you received the word of God, which you heard from us, you accepted it not as the word of men, but as it actually is, the word of God, which is at work in you who believe.
2 Timothy 2:9 ... for which I am suffering even to the point of being chained like a criminal. But God's word is not chained.
1 Peter 1:23 For you have been born again, not of perishable seed, but of imperishable, through the living and enduring word of God.
1 John 2:14 I write to you, fathers, because you have known him who is from the beginning. I write to you, young men, because you are strong, and the word of God lives in you, and you have overcome the evil one.
Revelation 1:2 ... who testifies to everything he saw--that is, the word of God and the testimony of Jesus Christ.

is living and active
Acts 7:38 He was in the assembly in the desert, with the angel who spoke to him on Mount Sinai, and with our fathers; and he received living words to pass on to us.
Isaiah 55:11 ... so is my word that goes out from my mouth: It will not return to me empty, but will accomplish what I desire and achieve the purpose for which I sent it.
Jeremiah 23:29 "Is not my word like fire," declares the LORD, "and like a hammer that breaks a rock in pieces?"

Sharper than any double-edged sword
1 Corinthians 14:24-25 But if an unbeliever or someone who does not understand comes in while everybody is prophesying, he will be convinced by all that he is a sinner and will be judged by all, and the secrets of his heart will be laid bare. So he will fall down and worship God, exclaiming, "God is really among you!"

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.