Mysticism
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1 John 4:1
Beloved, do not believe every spirit, but test the spirits to see whether they are from God. For many false prophets have gone out into the world.
1 Timothy 4:1
Now the Spirit expressly states that in later times some will abandon the faith to follow deceitful spirits and the teachings of demons,
Deuteronomy 18:10–12
Let no one be found among you who sacrifices his son or daughter in the fire, practices divination or conjury, interprets omens, practices sorcery, / casts spells, consults a medium or spiritist, or inquires of the dead. / For whoever does these things is detestable to the LORD. And because of these detestable things, the LORD your God is driving out the nations before you.
Colossians 2:8
See to it that no one takes you captive through philosophy and empty deception, which are based on human tradition and the spiritual forces of the world rather than on Christ.
Leviticus 20:6
Whoever turns to mediums or spiritists to prostitute himself with them, I will also set My face against that person and cut him off from his people.
1 Timothy 2:5
For there is one God, and there is one mediator between God and men, the man Christ Jesus,
2 Peter 1:21
For no such prophecy was ever brought forth by the will of man, but men spoke from God as they were carried along by the Holy Spirit.
John 16:13
However, when the Spirit of truth comes, He will guide you into all truth. For He will not speak on His own, but He will speak what He hears, and He will declare to you what is to come.