The singer warns Christians to behave properly, remembering Job and Lazarus. First verse: "Come all you worthy Christian men That dwell upon this land, Don't spend your time in rioting, Remember you're but man...."
The story of Lazarus is a parable of Jesus, recounted in Luke 16:19-31 (the Lazarus of John 11, 12 is unrelated). Thus there never was an actual Lazarus who lay at a rich man's door; he was simply an example.
The case of Job is, to say the least, more complicated. The Bible does indeed report that he was "the richest [man] in the east" (Job 1:3), that "he was brought to poverty" (Job 1:13-19), and that he "soon got rich again" (Job 42:10f.). But it can hardly be said that Job bore all this uncomplainingly; most of Job chapters 3-30 are devoted to his complaints! - RBW