"Lamp unto my feet" source (5)
I believe the answer is:
psalm
'lamp unto my feet source' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for psalm that I've seen before include "Jewish hymn" , "Sacred song from Old Testament" , "Song - hymn - prayer" , "Lamps for a sacred song" , "Religious chant" .)