How Reasons for the change were found
Remember, the central issue here in
Revelation 13 is worship and covenant faithfulnessincluding obedience to the law of God.
We have found the first three commandments are violated by the beast. But where do we find the fourth commandment,
dealing with the Sabbath?
In Revelation, both the followers of Jesus and the beast have inscriptions on their foreheads (see Revelation 13:16, 14:1).
While the followers of the beast have the mark of the beast in their foreheads and right hand, those who follow Jesus have the seal of God in their foreheads (see Revelation 7:3, 9:4).
Thus, the seal of God and the mark of the beast are used in contrast: to find one gives clues to finding the other.
As often required in Revelation, we need to go back to the Old Testament experiences of Israel to get an understanding of the language being used.