Q gave us a link to the "marching into the darkness" song by John Legend. I just found a youtube link to a song Jussie Smullet sand called "Never let it die". It has that line in the lyrics. Marching into the darkness. Here are the lyrics..
https://www.google.com/search?client=firefox-b-1-d&q=never+let+it+die+lyrics
and here is the youtube video
https://www.google.com/search?client=firefox-b-1-d&q=never+let+it+die+lyrics