The link, like the one above, is a within-Mudcat link, and only works if you are already within Mudcat, but it does appear to be working fine. You will find links there to a number of other sources about spirituals, and you may or may not get much help on your specific question from one of them.
It's most likely that you will get more specific assistance by watching this thread, here. But as you must know, the spirituals were only partially documented back in slave times, and every plantation had its own set of often-sung songs, with new "floating" verses being used on the spur of the moment. There were no "right" versions... Nailing down the origin any one song is unlikely, but you may get some further information on published versions from folks here who share your interest. Give it some time, OK, just bookmark this thread and check back once in awhile.