Revelation 1:18:

I am he that liveth, and was dead; and behold, I am alive for evermore, Amen; and have the keys of hell and of death.

Notes on Revelation 1:18:

Jesus HAS the keys of hell and of death, but this verse does NOT state that Jesus took the keys of hell and of death from the devil when he visited hell.  The devil doesn’t hang around hell anyway; it’s a place designed to torment him, so why would he want to be there?  If the devil had all the keys to hell before Jesus died, he could have just let his fallen-angel cohorts go free rather than leaving them in everlasting chains.  This whole matter is developed elsewhere in this book, so you can look into this in more detail if you like.

See also:

Notes on Matthew 18:18-20
Notes on Hebrews 2:14-15
How to Deal with the Devil
We Hold the Keys
Objection: Jesus, Not the Devil, Now Has the Keys of Death, So HE Is the One Who Makes People Die Today
Objection: Faith Preachers Are Trinity-Denying Heretics Because They Teach That Jesus Died Spiritually