What is the MARK OF THE BEAST?
The mark of the beast is a certain mark mentioned in the last book of the Bible, the book of Revelation.  The mark is a symbolic representation of a truth.  It is something that the enemies of God spiritually bear as proof that they will not inherit eternal life (the immortality promised by Yehovah God through in His Son, the Lord Yeshua [Jesus]).

The mark is best expressed in the Arabic phrase: "Allah is no Father" or "God is not the Father." Some would argue that the word 'Allah' in Arabic is the same as the English word 'God'.  We don't agree, but even the phrase "God is no/(not the) Father" IS precisely the mark of the beast.  Jesus alludes to this fact when speaking to the Pharisees in one instance, and Nicodemus in another.  Additionally, a certain version of the Arabic script for the phrase "Allah (God) is not the Father" is eerily similar (nearly identical) to the number 666 contained in the Codex Vaticanus.  Here are screen shots from Google translate (reading the above mark from right to left as it would be done in Arabic):

A visual translation of the word Father into Arabic script
Visual translation of Allah into Arabic script
No (negation)
Translation of the word no into Arabic script

A possible summary of what the mark is two-fold:
    1. This is the mark on the forehead - the place of belief: Willfull opposition to the sonship of Jesus (Matthew 10:33; 1 John 2:22-23) and His Gospel that teaches one must -themselves- be a son of God to be saved (John 3:5-7).  It is the denial of either Jesus as the son of God, or denying that the saved are those who are literal sons of God by His Spirit (1 John 4:9; 1 John 5:1)

    2.  This is the mark in the hand - the place of action:  Active lawlessness that proves one is not born of God (Matthew 7:22-24; Luke 5:32; Luke 13:3; Luke 24:46-47; Acts 2:38)

The mark can be in either the forehead OR hand (Revelation 13:16).  It doesn't have to be in both places.  This is why it is important to work out your faith, to test yourself, to practice righteousness.  This is why Jesus tells people that some will confess His name (they believe in their heads - so no mark of the beast on their forehead), but by their actions they will deny him (workers of iniquity/lawlessness - their actions prove they have the mark in their hand - the place of action). (See Matthew 15:8)

Other than the book of Revelation, the two places that mention the number 666 in scripture are connected to:

    1.  A man whose name means "Lord of Enemies"
    2.  The turning of one's heart from the God and Father of Jesus because of riches or lust

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