en_tn_condensed/rev/01/02.md

who testified about ... all the things that he saw

The word "who" refers to John. This tells what John did after he learned about the revelation. Alternate translation: "And John testified about ... all the things that he saw"

the word of God

"the message that God spoke"

the testimony of Jesus Christ

These words could refer to 1) the testimony that John has given about Jesus Christ. Alternate translation: "he has also given testimony about Jesus Christ" Or 2) the testimony that Jesus Christ has given about himself.