بَارَكَ اللَّهُ لَكَ، وَبَارَكَ عَلَيْكَ، وَجَمَعَ بَيْنَكُمَا فِي خَيْرٍ
Barakallahu laka, wa baraka 'alayka, wa jama'a baynakuma fi khayr
May Allah bless you, shower His blessings upon you, and bring you together in goodness.
Say to newlyweds after marriage
The Prophet (PBUH) would say this dua for newlyweds, asking Allah to bless their union.