Revelation 22:6
And he said unto me, These sayings are faithful and true: and the Lord God of the holy prophets sent his angel to shew unto his servants the things which must shortly be done. (Revelation 22:6)
Faithful and true.
A statement of the trustworthiness and genuineness of God’s revelation; the prophecy as given by the angel is authentic.
Of the holy prophets.
 Textual evidence attests (cf. p. 10) the reading “of the spirits of the prophets.” The “spirits of the prophets” may be regarded as a reference to the prophets’ own spirits under the control of the Holy Spirit when they were in vision. The Holy Spirit illumined John’s spirit as He had the spirits of the OT prophets (see ch. 1:10). The entire Revelation is a testimony to the control of John’s spirit in vision by the Holy Spirit.