when you marry a woman or buy a maidservant, you should say:
اللَّهُمَّ إِنِّي أَسْأَلُكَ خَيْرَهَا، وَخَيْرَ مَا جَبَلْتَهَا عَلَيْهِ، وَأَعُوذُ بِكَ مِنْ شَرِّهَا، وَشَرِّ مَا جَبَلْتَهَا عَلَيْهِ
Allāhumma innī asʾaluka khayrahā, wa khayra mā jabaltahā ʿalayhi, wa aʿūdhu bika min sharrihā, washarri mā jabaltahā ʿalayh
O Allah, I ask You for the goodness within her and the goodness that you have made her inclined towards, and I take refuge with You from the evil within her and the evil that you have made her inclined towards.
and if you buy a camel, then you should take hold of it’s hump and say likewise.