I took this pattern from the rhythm of the hi hats on the original Chris Tomlin recording but because it’s a straight groove there’s a lot of license to build your own pattern. So lots of patterns could work. Just be careful not to add to many up strum pushes so to upset the straight beat rock nature of the song itself. Interestingly its actually very similar to the Shout to the Lord groove, just sped up.
We have Forever as one of our Worship Backing Band DVD tracks. You can remove the guitar from the mix and play along with the pro band (the words and chords are all on screen). Its also one of the songs taught on our Beginners Worship Guitar course.