According to Smrtiratnam, the following mantra is to be recited at the time of performing kanyA dAnam during vivAha :
kanyAm lakshaNa samyuktAm kanakAbharaNairyutAm!
dAsyami vishNave tubhyam brahmaloka jigIshayA !!
Desiring to reach the abode of Brahma, I give as kanyA DAnam the bride with good features and decked with golden ornaments to you (a deserving groom) who is VishNu svarUpa .