“Run On” but has several other names...”God’s Gonna’ Cut You Down” or “Run On For A Long Time”....the song was performed by Johnny Cash, Elvis, Odetta, and Stamps Baxter Quartet.
Elvis ~ Run On
https://www.youtube.com/watch?v=anjdacZhyno
Johnny Cash ~ God’s Gonna Cut You Down
https://www.youtube.com/watch?v=IStlBOX9F4o