On the wedding night or when buying an animal

When you marry a woman or buy a maidservant, you should say:

اَللّٰهُمَّ إِنِّيْ أَسْأَلُكَ خَيْرَهَا، وَخَيْرَ مَا جَبَلْتَهَا عَلَيْهِ، وَأَعُوْذُ بِكَ مِنْ شَرِّهَا، وَشَرِّ مَا جَبَلْتَهَا عَلَيْهِ

O Allah, I ask You for the goodness of her and the goodness upon which You have created her, and I seek refuge in You from the evil of her and from the evil upon which You have created her.

Allaahumma 'innee 'as'aluka khayrahaa wa khayra majabaltahaa 'alayhi wa 'a'oothu bika min sharrihaa wa sharri maajabaltahaa 'alayhi.

If you purchase a camel then take hold of the top of its hump and say the same.