Not just for the book of Revelation, but entire bible as the following verses will prove.
Deut. 4:1-2
12:29-32 Do all commanded, not add to it, not remove from. Xmas, Easter, Sunday adds to.
GOD adds to it by His own inspiration as He continues to speak to His chosen servants in all generations. More scripture was added in the time of the Maccabees. And then again in the New Testament times. If GOD truly inspires someone to write GOD's doctrines and revelations and messages, that's not in violation of this commandment in Deut and Rev.
But if a translator or pastor or anyone purposely adds to OR takes away without fear of GOD and/or for the purpose of deceit and/or false doctrine, then they are in violation.
Gal. 1:6-9 If bring to you another gospel, which is not another, as if from an angel.
Mormon writings claim to come from angel, and some from ancient Egyptian manuscripts.
The translation of those Egyptian words and pictures in Book of Abraham proven false.
Koran also claimed to come from an angel.
Moses didn't hear from an angel, but from GOD Himself! Same with Paul.
John 10:1-5 Know GOD's voice, flee/run from strangers (false bibles and Babylon preachers)
2 Tim. 3:12-17 EVERY word of scripture inspired by Theos and profitable
Importance of just one word. Such as Gen. 1:2 was = became
EVERY word is important! Bible translations should try to stick with the most strict translation as possible. But the following versions have NO respect for the holiness of the bible! They add to and take away with great leisure, without fear of GOD! These are the worst translations among most popular bible versions. (Instead of people always fighting NIV and NASB, they need to be fighting the worst, which are listed below.)
Avoid such websites/videos/audio that use the most corrupted versions of the bible such as:
(Throw these away!)
Common English Bible (CEB)
Contemporary English Version (CEV)
Good News Translation (GNT)
The Message
Revised Standard Version (RSV) (Catholic version)
New Revised Standard Version (NRSV) (Catholic version)
Book of Mormon, Book of Abraham, other Mormon writings.
Jehovah Witness Bibles
Writings of Ellen White
Koran
Christian Standard Bible (CSB, HCSB) (Extremely popular.) (It's also a Y name version!)
All/any Y name bible.
The books listed above have NO place in the houses of the saints! Throw out the trash!
False accusation that the NIV and NASB removes tons of verses and words from scripture. Actually the KJV adds those words and verses that people claim are removed in NIV & NASB.
Avoid all Y name websites/videos/audio. We don't need them. The truth is revealed in the bible and in prayer and fasting, and even in dictionary, encyclopedia and history. We don't need lost preachers, especially the ones that worship Satan via the demonic Assyrian Y names. But we also don't need preachers who worship demonic Assyrian holidays such as Easter and Christmas and who don't keep the 7th day Holy.
The AOB is very strict in what has been translated! I am very aware of curses upon me and the lost of my salvation if I alter The Holy Scriptures! I have not altered them. I have only translated them. I do have to add some English words to make it make sense. That's just simply how translation is done. It can't always be just one word in English. But I do my best to keep one word as one word as much as possible. Some words I give 2-3 or more possibilities instead of taking the risk of wrong translation. I don't know of ANY other bible translation that does that!