بارَكَ اللّهُ لَك، وَبارَكَ عَلَـيْك، وَجَمَعَ بَيْـنَكُما في خَـيْر
Barakal-lahu lak, wabaraka AAalayk, wajamaAAa baynakuma fee khayr
Translation
May Allah bless for you (your spouse) and bless you, and may He unite both of you in goodness.
When to recite
Said to the newlywed couple as a blessing.
Source / Reference
Abu Dawud 2/228, At-Tirmithi 3/198