Lyrics to the Wedding March are sung at the end of the film, "The Best Years of Our Lives", when Homer (Harold Russell) marries Wilma (Cathy O'Donnell).
The little children at the wedding sing, accompanied by Hoagy Carmichael on piano. It's been a long time since I've seen the movie, but to the best of my knowledge, the lyrics are quite close to those posted by Amos:

"Here comes the bride,
All dressed in white
Sweetly, serenely,
In the soft glowing light

Lovely to see
Marching to thee
Sweet love united
For eternity"