This David Haas song is for the Mandatum on Holy Thursday. It has plenty of verses for a lot of washing. Since it is only used once a year it is fair enough to have a singable refrain for the assembly and a more challenging set of verses for a cantor.
My version of Gather Comprehensive only has the music for the refrain so I had to cobble the rest together.
You can find the text in the page scans at Hymnary.
You can purchase the sheet music at GIA. There are descants and instrumental additions to maintain interest for as long as necessary.
I thought this backing sounded OK, but I’ve noticed the bass line is somewhat idiosyncratic so I’m not sure what BIAB was up to.