Supplication upon purchasing a vehicle or an animal

اَللّٰہُمَّ اِنِّیْٓ اَسْئَلُکَ خَیْرَہَا وَ خَیْرَ مَا جَبَلْتَہَا عَلَیْہِ وَ اَعُوْذُبِکَ مِنْ شَرِّہَا وَ شَرِّ مَا جَبَلْتَہَا عَلَیْہِ

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.
(The Prophet ﷺ if you purchase a camel then take hold of the top of its hump and say the same.)

[Sunan Abu Dawud – 2160]