Why did Jesus Christ call Peter Satan?

Matthew 16:23 MEV
But He turned and said to Peter, *"Get behind Me, Satan!* You are an offense to Me, for you are not mindful of the things that are of God, but those that are of men."

Why did Satan entered Judas? Because his heart & mind was not good.

John 13:27 MEV
After receiving the piece of bread, *Satan entered him. Then Jesus said to him, "What you are going to do, do quickly."*

According to the BIBLE not according to me, Satan is a demonic spirit looking for whomever if available to either influenced or used to fulfill the desires of the King of darkness. Don't allow Satan to use you. God bless you.
Editor's Critical Eye