"Has God indeed said?" This is the question that the deveil still uses in our lives to cause us to doubt God and His Word. It is vital for us to know what God is saying and then to believe it with all our hearts!
Every time we are deceived it is because we are not listening to the voice of God, and God's question to us is always "who told you?" In other words, who have you been listening to?

Genesis 3:1 and Genesis 3:11