From the recording Christmas Light Medley
Due to copyright regulations, the lyrics will not be posted here. However, if you enter the name of either song into a search engine on your computer, along with the word 'lyrics', you should find numerous relevant resources.
Lyrics
"Do You Hear What I Hear?"
Words and music by Noel Regney and Gloria Shayne
"Great Light of the World"
Words and music by Jeffrey Stephen Norman