Here's the version from Silber & Silver, Folksinger's WordBook:

Hold On

        Em
  Mary wore three links of chain,
                  Am7    Em
  Every link was Jesus' name.
                                B7 Em
  Keep your hand on that plow, hold on.
  
  Chorus:
  B7            Em
  Hold on, hold on,
                                B7 Em
  Keep your hand on that plow, hold on.
  
  God gave Noah the rainbow sign,
  No more water but fire next time, etc.
  
  Paul and Silas bound in jail,
  Had no money for to go their bail, etc.
  
  The very moment I thought I was lost,
  The dungeon shook and the chains fell off, etc.
  
  Paul and Silas began to shout,
  Jail doors opened and they walked out, etc.
  
  Peter was so nice and neat,
  Wouldn't let Jesus wash his feet, etc.
  
  Got my hands on the gospel plow,
  Wouldn't take nothin' for my journey now, etc.