IN-35
Invocation for the groom
Baarakallaahu laka, wa baaraka 'alayka, wa jama'a baynakumaa fee khayrin.
May Allah bless you, and shower His blessings upon you , and join you together in goodness.
Reference: Abu Dawud, Ibn Majah and At-Tirmithi. See also Al-Albani, Sahih At-Tirmithi 1/316
The groom's invocation and what he says upon purchasing an animal
When any of you marries a woman or purchases a maid-servant then let him say :
.Allaahumma 'innee 'as'aluka khayrahaa wa khayra majabaltahaa 'alayhi wa 'a'oothu bika min sharrihaa wa sharri maajabaltahaa 'alayhi.
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.
If you purchase a camel then take hold of the top of its hump and say the same.
Reference: Abu Dawud 2/248 and Ibn Majah 1/617. See also Al-Albani, Sahih Ibn Majah 1/324.
Invocation to be recited before intercourse
Bismillaah. Allaahumma jannibnash-Shaytaana, wa jannibish-Shaytaana maa razaqtanaa.
With the Name of Allah. O Allah, keep the I Devil away from us and keep the Devil away from that which You provide for us.
Reference: Al-Bukhari 6/141, Muslim 2/1028.