Pour out
'Pouring out the vials upon the earth, which contained the plagues,' in Revelation 16:1, signifies influx of the reformed into the church, or into people who study and receive the doctrine of justification by faith alone.
(Odkazy: Apocalypse Explained 16; Apocalypse Revealed 676)
Written on the back
In Revelation 5:1, the book being written on the back signifies the Word in its general sense. (Apocalypse Revealed 256)
In Ezekiel 8:16, this signifies denial of the Lord God, one of the abominations of the decadent Jerusalem. (Apocalypse Explained 401[32])