بَارَكَ اللَّهُ لَكَ وَبَارَكَ عَلَيْكَ وَجَمَعَ بَيْنَكُمَا فِي خَيْرٍ
Barakallahu laka wa baraka 'alayka wa jama'a baynakuma fi khayr
May Allah bless you and shower His blessings upon you, and bring you both together in goodness.
This is the Sunnah way to congratulate newlyweds. The Prophet ﷺ taught this instead of the pre-Islamic congratulation which focused on worldly wishes. This du'a focuses on barakah (divine blessing) and goodness in the union.
Related Du'as
اللَّهُمَّ أَلِّفْ بَيْنَ قُلُوبِنَا وَأَصْلِحْ ذَاتَ بَيْنِنَا وَاهْدِنَا سُبُلَ السَّلَامِ وَنَجِّنَا مِنَ الظُّلُمَاتِ إِلَى النُّورِ وَجَنِّبْنَا الْفَوَاحِشَ مَا ظَهَرَ مِنْهَا وَمَا بَطَنَ
O Allah, unite our hearts, mend our relations, guide us to paths of peace, deliver us from darkness into light, and keep us away from indecencies — both outward and inward.
Sahihاللَّهُمَّ ارْزُقْنِي زَوْجَةً صَالِحَةً إِذَا نَظَرْتُ إِلَيْهَا سَرَّتْنِي وَإِذَا غِبْتُ عَنْهَا حَفِظَتْنِي فِي نَفْسِهَا وَمَالِي
O Allah, provide me with a righteous wife — one who pleases me when I look at her, and who guards herself and my wealth in my absence.
Hasanاللَّهُمَّ اجْعَلْ بَيْنَنَا مَوَدَّةً وَرَحْمَةً وَسَكِينَةً، وَأَلِّفْ بَيْنَ قُلُوبِنَا وَاجْعَلْنَا قُرَّةَ أَعْيُنٍ لِبَعْضِنَا
O Allah, place between us affection, mercy, and tranquility. Unite our hearts and make us the coolness of each other's eyes.
Sahihبِسْمِ اللَّهِ اللَّهُمَّ جَنِّبْنَا الشَّيْطَانَ وَجَنِّبِ الشَّيْطَانَ مَا رَزَقْتَنَا
In the Name of Allah. O Allah, keep Shaytan away from us and keep Shaytan away from what You bless us with.
Sahih