I’m seeking out Marty Haugen sings that I haven’t come across elsewhere that are in my copy of Gather Comprehensive.
This is actually an African-American spiritual for which Haugen has written seven extra verses. The music is attributed to Barbara Jackson Martin, but it is elsewhere called traditional and merely harmonised by her.
The sheet music for this version can be purchased at GIA, where the sample pages give you Haugen’s text. In GC it is in G, but the website drops it to Eb, which is a good idea.
There are other versions on the web that share some of the words and have very different tunes.
This is vastly different version more like in Hymnary: