If this is for a church wedding, it should be a sacred text, not pop songs, comic songs or jazz standards as have been suggested.
I would recommend "His Eye Is On the Sparrow" (1905), which was made famous by Ethel Waters. Its music is by Charles H. Gabriel (American 1856-1932).Texts and MIDI transcriptions of "His Eye Is on the Sparrow" and 21 other Gabriel songs are at:https://www.angelfire.com/ks/landzastanza/chg.html