This is another song for weddings in Gather 3rd edition. The text is by Vicki Klima as adapted by Michael Joncas and George Szews and the tune is by Joncas.
The text is here and the sheet music can be purchased at GIA. It is for cantor, choir, assembly and organ with optional trumpet, if you have such things at your wedding. Even the guitar version I have has harmony lines in both chorus and verses, but I suspect it would often wind up a solo vehicle at an appropriate time during the service – signing registers etc.