What one says when he marries a woman and goes in to her

Amr bin Shu'ayb narrates from his father, from his grandfather (may Allah be pleased with him), that the Prophet (peace and blessings be upon him) said: "When one of you acquires a wife, a servant or an animal, let him take hold of its forelock, mention the name of Allah and say: 'Allahumma inni as'aluka khayraha wa khayra ma jabaltaha 'alayh, wa a'udhu bika min sharriha wa sharri ma jabaltaha 'alayh' (O Allah, I ask You for its good and the good of what has been created in its nature, and O Allah, I seek refuge with You from its evil and from the evil that has been placed in its nature)."

Ibn Ajlan (may Allah have mercy on him) also mentioned similar to it: that he should take hold of its forelock, pray for blessing and say.
(b) He mentioned it and added: If it is a camel, he should take hold of its hump and say.