Revelation 1:5

5 And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood,

Notice it says, "and from Jesus Christ"; John sees Jesus as a distinct person from the one on the throne that just gave the greeting with a seven-fold Spirit before Him. The doctrine of the trinity is supported here and in other places in this book as it also is throughout scripture. The Father, the seven-fold Holy Spirit and the Son of God are identified in Revelation 1:4-5 of this first chapter of Revelation.

Jesus is the faithful witness and the first begotten of the dead. He also is the King of Kings and Lord of Lords. Verse five also gives us the doctrine of salvation. We must accept the sacrifice that Jesus fulfilled and have our sins washed away by his blood.

The verse also says that He saved us because He loved us and this implies that He loved us while we were still sinners.

John 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

Under the law given to Israel it took a spotless lamb to atone for the sins of the nation once each year. This was looking forward to the spotless Lamb of God (Jesus) that would be our sacrifice once for all time. All are clean who accept this free sacrifice given by God for our sins. The fifth verse in Revelation disproves any theology that claims a limited atonement for sin. If the blood of the Lamb of God has cleansed us, then we are clean.

Hebrews 10:12 But this man, after he had offered one sacrifice for sins forever, sat down on the right hand of God;