Recite:
اللَّهُمَّ إِنِّي أَسْأَلُكَ خَيْرَهَا وَخَيْرَ مَا جَبَلْتَهَا عَلَيْهِ وَأَعُوذُ بِكَ مِنْ شَرِّهَا وَشَّرَّ مَا جَبَلْتَهَا عَلَيْهِ
"O Allah, I seek the good in it from You and the goodness in the habit and character in it/her and seek refuge in You from its/her evil habits and character".
Note: Recite the above dua whilst holding the forehead of the bride for Barakaat (blessings). (Mishkat from Abu Dawood and Ibn Maja)
