Reference : Hisn al-Muslim 190

بارَكَ اللّهُ لَك، 
وَبارَكَ عَلَـيْك، 
وَجَمَعَ بَيْـنَكُما في خَـيْر
Bārakallāhu lak, 
wa bāraka `alayk, 
wa jama`a baynakumā fī khayr.


May Allah bless you,
and shower His blessings upon you, 
and join you together in goodness.

Reference:
Abu Dawud, Ibn Majah and At-Tirmidhi. See also Al-Albani, Sahih At-Tirmidhi 
1/316.

Chapter: To the newlywed