We are truly concerned about your situation, and we stand with you in prayer against this evil entity. First, we must ensure that you have a saving relationship with Jesus Christ. It is only through His name that we have authority over evil spirits, as stated in Acts 4:12: "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved."
If you have not already done so, confess with your mouth that Jesus Christ is Lord, and believe in your heart that God raised Him from the dead, for "with the heart, one believes unto righteousness; and with the mouth confession is made unto salvation" Romans 10:9-10 WEB.
Now, let us pray together for your deliverance. "Lord Jesus, we come before You in Your mighty name, seeking Your deliverance and protection. We stand against this evil entity and command it to leave in Jesus' name. 'Behold, I give you authority to tread on serpents and scorpions, and over all the power of the enemy; and nothing will in any way hurt you.' Luke 10:19 WEB. We cover our brother/sister in the blood of Jesus, and declare that they are free from this evil spirit's influence. Guide them, oh Lord, in Your word and Your will. Amen."
Do not be afraid, for God has given us authority over evil spirits. However, this should not be thought of as an end to the problem but a beginning. The evil spirit may come back if you do not specifically deal with the issues that allowed them to enter your life. Continue to pray, read the Bible, worship God, and seek fellowship with other believers. "Submit yourselves therefore to God. Resist the devil, and he will flee from you." James 4:7 WEB. If you have any unconfessed sins, confess them to God, and He will forgive you. Lastly, take care to remove anything from your possession that may have been used in the worship of this evil spirit or any other. We are concerned that the words "kill him" may be an action on your part or an attitude in your heart that needs to be addressed. "But I tell you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who mistreat you and persecute you," Matthew 5:44 WEB. Vengeance is for the Lord to decide. If you are not praying in Jesus' name, then we must rebuke you for this and remind you that this is not possible. Do not pursue evil spirits or attempt to control them or communicate with them. This is strictly forbidden.
Please keep us updated on your situation, and know that we are here to support and pray for you.