IT IS MUSTAḤABB to mention the name of Allah and then hold her by the forelock when he first meets her, and to say: ‘May Allah bless each of us in our companion’:
Bāraka-llāhu li-kulli wāḥidin minnā fī ṣāḥibih.
And to say together with it that which we relate, with ṣaḥīḥ isnāds, from the Sunans of Abū Dāwūd and Ibn Mājah, that ‘Amr ibn Shu‘ayb reported from his father, who reported that his grandfather related that the Messenger of Allah 
said: “If any of you marries a woman or buys a slavegirl, he should say: ‘O Allah, I ask for the good in her and the good that You have created in her, and I seek Your protection from her evil and the evil that You have created in her.” [1].If he buys a camel he should take hold of the top of its hump and say the same. According to another report he said: “Then he should take hold of her forelock and say a du‘ā’ for blessing in the woman or the slavegirl.” [2].
said: “If any of you marries a woman or buys a slavegirl, he should say: ‘O Allah, I ask for the good in her and the good that You have created in her, and I seek Your protection from her evil and the evil that You have created in her.” [1].If he buys a camel he should take hold of the top of its hump and say the same. According to another report he said: “Then he should take hold of her forelock and say a du‘ā’ for blessing in the woman or the slavegirl.” [2].
Allāhumma innī as’aluka khayrahā wa khayra mā jabaltahā ‘alayh, wa a‘ūdhu bika min sharrihā wa sharri mā jabaltahā ‘alayh.
References
[1] Abū Dāwūd (2130), at-Tirmidhī (1091), and Ibn Mājah (1905). Ibn Ḥajar states that Abū al-Fatḥ al-Qushayrī in al-Iqtirāḥ grades this hadith as ṣaḥīḥ according to the criteria of Imam Muslim. Al-Futūḥāt (6/79).
[2] Abū Dāwūd (2160), Ibn Mājah (1918), Ibn as-Sunnī (605), and al-Ḥākim in al-Mustadrak (2/185), who grades this hadith as ṣaḥīḥ, and adh-Dhahabī agrees.