Put on the whole armor of God so that you may be able to stand against the tricks of the devil. ...
Take up the whole armor of God so that you may be able to withstand in the evil day and having done all, to stand.
Stand therefore having put on the belt of truth,
having put on the breastplate of righteousness,
having put on the shoes of the gospel of peace,
above all take the shield of faith with which you will be able to put out all the fiery darts of the wicked one.
And put on the helmet of salvation,
and take the sword of the Spirit which is the word of God. (Ephesians 6:11-17)
To put on this armor of God you have to:
Be truthful in your dealings (belt of truth)
Do the right thing in the sight of God (breastplate of righteousness)
Read your Bible (shoes of the Gospel)
Believe the Bible (shield of faith)
Say with your mouth that "Jesus is Lord" and believe in your heart that when He died for our sins God raised Him from the dead and you will be saved. (Romans 10:9) (helmet of salvation)
Speak Bible verses (sword of the Spirit which is God's word)