When putting on the whole armor of God, we are to take the sword of the Spirit. God told us exactly what the sword of the Spirit is--"which is the word of God." The word of God is the Bible. He gave the scriptures to man, who wrote them down. These were then assembled into the Holy Bible.

2 Timothy 3:16-17 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: That the man of God may be perfect, throughly furnished unto all good works.

John 5:39-40 Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me. And ye will not come to me, that ye might have life.

Romans 15:4-7 For whatsoever things were written aforetime were written for our learning, that we through patience and comfort of the scriptures might have hope. Now the God of patience and consolation grant you to be likeminded one toward another according to Christ Jesus: That ye may with one mind and one mouth glorify God, even the Father of our Lord Jesus Christ. Wherefore receive ye one another, as Christ also received us to the glory of God.

Romans 16:25-27 Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, But now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith: To God only wise, be glory through Jesus Christ for ever. Amen.

Galatians 3:22-29But the scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe. But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed. Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith. But after that faith is come, we are no longer under a schoolmaster. For ye are all the children of God by faith in Christ Jesus. For as many of you as have been baptized into Christ have put on Christ. There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus. And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.

When we take the sword of the Spirit, we are taking God's Holy Word. We are also taking with us Jesus. The Bible says that Jesus is the Word:
John 1:1-17
1. In the beginning was the Word, and the Word was with God, and the Word was God.
2. The same was in the beginning with God.
3. All things were made by him; and without him was not any thing made that was made.
4. In him was life; and the life was the light of men.
5. And the light shineth in darkness; and the darkness comprehended it not. 7. The same came for a witness, to bear witness of the Light, that all men through him might believe.
8. He was not that Light, but was sent to bear witness of that Light.
9. That was the true Light, which lighteth every man that cometh into the world.
10. He was in the world, and the world was made by him, and the world knew him not.
11. He came unto his own, and his own received him not.
12. But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
13. Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
14. And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
15. John bare witness of him, and cried, saying, This was he of whom I spake, He that cometh after me is preferred before me: for he was before me.
16. And of his fulness have all we received, and grace for grace.
17. For the law was given by Moses, but grace and truth came by Jesus Christ.

Satan will try using bits of scriptures to trip you up and make you fall, if you don't know the God's word for yourself. The devil tried tempting Jesus when he was in the wilderness, but Jesus fought back with scripture because He knew the word of God. He was prepared with the sword of the Spirit.
Matthew 4:1-11
1.Then was Jesus led up of the Spirit into the wilderness to be tempted of the devil.
2. And when he had fasted forty days and forty nights, he was afterward an hungred.
3. And when the tempter came to him, he said, If thou be the Son of God, command that these stones be made bread.
4. But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.
5. Then the devil taketh him up into the holy city, and setteth him on a pinnacle of the temple,
6. And saith unto him, If thou be the Son of God, cast thyself down: for it is written, He shall give his angels charge concerning thee: and in their hands they shall bear thee up, lest at any time thou dash thy foot against a stone.
7. Jesus said unto him, It is written again, Thou shalt not tempt the Lord thy God.
8. Again, the devil taketh him up into an exceeding high mountain, and sheweth him all the kingdoms of the world, and the glory of them;
9. And saith unto him, All these things will I give thee, if thou wilt fall down and worship me.
10. Then saith Jesus unto him, Get thee hence, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.
11. Then the devil leaveth him, and, behold, angels came and ministered unto him.

Did you notice how Jesus battled by saying, "It is written...." in answer to Satan's temptations? Jesus didn't jump and down, shout, scream, lay on the ground and kick His feet. Instead He simply and with authority spoke the word of God, which He knew by memory.

Memorize the scriptures. Take unto you the sword of the Spirit, which is the word of God. Stand against Satan's attacks by knowing the word of God for yourself. Don't take someone else's word of what the scriptures say. Study it out for yourself. 2 Timothy 2:15 Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth.

May God send His Spirit to lead you into the truth, and help you study His holy word. Take it with you always.

Ephesians 6