The KJV has 3 sets of 7 references to each of the following words and phrases;
1. The Word
2. The Mediator
3. "After the order of Melchisedec"
All three of these terms refer to the Lord Jesus Christ.
The NIV has removed 1 of each of these words. So the NIV has 3 descriptions of Christ that add up to 666, the number of the beast as said in thirteenth chapter of the book of Revelation. The KJV numbers are 777.
