“I John, who also am your brother, and companion in tribulation, and in the kingdom and patience of Jesus Christ, was in the isle that is called Patmos, for the word of God, and for the testimony of Jesus Christ.” – Rev. 1:9

Believers are companions (knit together as brothers and sisters and fellow-partners)

… in the kingdom

… and in tribulation (persecution, affliction, distress)

– the kingdom and tribulation come hand in hand.

… and in the patience of Jesus.

The purpose for which is:

the sufficient word of God

… and for the testimony of Christ.