“To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.” Isaiah 8:20
God never contradicts himself. We are supposed to divide the Word properly, but as you study it you will find that it never contradicts itself. Even when there are changes from an old covenant to a new covenant God’s entire plan works together cohesively like one big picture with different parts. When we accept Christ, the Holy Spirit is given to us with the promise that He will teach us and guide us in truth. The Holy Spirit will never contradict God The Father nor the Word of God.
Of course, you know that this world is full of "Fake News." It's also full of fake messages. There are people posing as preachers of the Gospel that speak things which are diametrical opposed to the Word of God. If the message contradicts the Bible or if it is contrary in any way, the messenger is suspect. In fact, God says that if their message doesn't match what He has already said in His word, they are fakes.