This is another of the amazing songs with lyrics by James McAuley and music By Richard Connolly. It is included in the collection Year of Grace Music Book available at As One Voice.
It is based on Rev 22:17. I can’t find the text online, so you’ll have to sing along from the book. I see the sheet music with annotations from the the composer is available at the Veech library in Sydney.
When I worked out chords from the sheet music they were all rather jazzy so my backing went off in that direction.