Matthew 4:4
He [Jesus] answered and said, “It is written, ‘Man shall not live by bread alone, but by every word that proceeds from the mouth of God.'”
When the devil tempted Jesus, Jesus turned the Word of God on him, saying, “It is written…It is written…It is written…” (Matthew 4:4, 7, 10) Likewise, should the devil remind you of the pain in your body, say what God’s Word says: “It is written, ‘By His stripes I am healed!'” (Isaiah 53:5; 1 Peter 2:24) And tell Daddy God, “I have Your Word for it and I am standing on Your Word. I am not trying to be healed. My healing has already happened. I don’t care what this body says. It has to line up with Your Word because by Jesus’ stripes I am healed!”
And if the devil says to you, “Look at the meager balance in your bank account. How are you going to pay your bills?” just say, “I’m not going to worry because I know that my God shall supply all my needs according to His riches in glory by Christ Jesus. (Philippians 4:19) It doesn’t matter how much I have in the bank. God’s Word tells me that as the need arises, the supply will be there!”
When fear grips you, don’t say to yourself, “This fear is stupid. Come on, what are the chances of it happening to me?” Don’t try to rationalize or reason your fear away. Instead, speak God’s Word into the situation. Say, “It is written, ‘For God has not given me a spirit of fear, but of power and of love and of a sound mind.'” (2 Timothy 1:7) What if the fear returns? Speak God’s Word again. Say, “It is written, ‘For God has not given me a spirit of fear…'”
When the devil tries to deceive you, give him the Word of God. There is something about the Word of God that causes him not to want to hang around those who use it. It reminds him of Jesus, the Word made flesh (John 1:14), who rendered him powerless and of no effect when He said, “It is written…”