Ephesians 6:10-17 says:
10To end my letter I tell you, be strong in the Lord and in his great power. 11Wear the full armor (protection) of God. Wear God's armor so that you can fight against the devil's evil tricks. 12Our fight is not against people on earth. We are fighting against the rulers and authorities and the powers of this world's darkness. We are fighting against the spiritual powers of evil in the heavenly places.13That is why you need to get God's full armor. Then on the day of evil you will be able to stand strong. And when you have finished the whole fight, you will still be standing. 14So stand strong, with the belt of truth tied around your waist. And on your chest wear the protection of right living. 15And on your feet wear the Good News of peace to help you stand strong.16And also use the shield of faith. With that you can stop all the burning arrows of the Evil One (the devil).17Accept God's salvation to be your helmet. And take the sword of the Spirit--that sword is the teaching of God. (Easy-to-Read Version)
King James Version: 10Finally, my brethren, be strong in the Lord, and in the power of his might. 11Put on the whole armour of God, that ye may be able to stand against the wiles of the devil. 12For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. 13Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand. 14Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness; 15And your feet shod with the preparation of the gospel of peace; 16Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked. 17And take the helmet of salvation, and the sword of the Spirit, which is the word of God.