Revelation, Apocalypse does not speak of sipirit of prophecy but of spirit of THE prophecy that is the book of Revelation.

It seems that Only the ABP (The Apostolic Bible Polyglot 2006) version PERFECTLY translates Revelation 19:10.

Revelation 19:10 ABP
(10) And I fell before his feet to do obeisance to him. And he says to me, See that you do not! [fellow-servant I am your], and of your brethren having the testimony of Jesus; to God do obeisance! For the testimony of Jesus is the spirit of the prophecy

2 Corinthians 11:13-15 ASV
(13)  For such men are false apostles, deceitful workers, fashioning themselves into apostles of Christ. (14)  And no marvel; for even Satan fashioneth himself into an angel of light. (15)  It is no great thing therefore if his ministers also fashion themselves as ministers of righteousness, whose end shall be according to their works.

Genesis 9:3-4 ASV
(3)  Every moving thing that liveth shall be food for you; as the green herb have I given you all. (4)  But flesh with the life thereof, which is the blood thereof, shall ye not eat.

Note: God (MESSIAH YAHWEH YEHOSHUA) commands to eat flesh not with the blood and the fat but SDA teaches not to eat flesh, et cetera. Who contradicts Jesus? SDA teaches Jesus is Archangel Michael (John 8:24). It only takes one sin or iniquity (Ezekiel 33:13.).