'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.

(Izinkomba: Apocalypse Explained 16; Apocalypse Revealed 676)

323. In the celestial sense bearing false witness means speaking blasphemy against the Lord and the Word, thus chasing truth out of the church. For the Lord is truth itself, and so equally is the Word. On the contrary, bearing witness in this sense means speaking the truth, and testimony means truth itself. That too is why the Ten Commandments are called the testimony (Exodus 25:16, 21-22; 31:7, 18; 32:15; 40:20; Leviticus 16:13; Numbers 17:4, 10). Because the Lord is truth itself, He says of Himself that He bears witness. The Lord is truth itself (John 14:6; Revelation 3[:7, 14]). He bears witness and is Himself His own witness (John 3:11; 8:13-19; 15:26; 18:37-38).