This is an early Marty Haugen song based on Psalm 50 (51). I always surprised to come across one of his that I haven’t already heard. It isn’t suitable for use as the psalm but is fine as a hymn.
He has done other settings since, but this one is still available in the collection, I Send My Light, from GIA – still only $US 5.95.
There is a preview of the whole collection at GIA, so you can check the text and sheet music to see if you would like a physical copy. At least it isn’t out of print, like many of the the songs in CWB I.