بارَكَ اللّهُ لَك،
وَبارَكَ عَلَـيْك،
وَجَمَعَ بَيْـنَكُما في خَـيْر
English
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.