And the third angel followed them, saying with a loud voice,... Rev.14:9
"Consequently the third angle's message, Rev. xiv, 9-12, is the
sealing message, containing the seal of the living God.
There can be no message later than this,
for it decides the destiny of all that hear it.
All who reject it must suffer the unmingled wrath of God. And it is followed by the coming of the Son of man.
From the fact that the third angel warns against the reception of the mark of the beast, we may readily infer that he bears the seal of God, which stands indirect opposition to that mark. Men are to choose between the two, and this choice decides their destiny.
O, solemn message!" RFC