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At-Tirmidhi (1091)بَارَكَ اللَّهُ لَكَ، وَبَارَكَ عَلَيْكَ، وَجَمَعَ بَيْنَكُمَا فِي خَيْرٍ
Barakallahu lak, wa baraka 'alayk, wa jama'a baynakuma fi khayr.
May Allah bless you, may He bestow His blessings upon you, and may He unite you both in goodness.
Virtue
The Prophet ﷺ used to congratulate the newlyweds with this supplication. This is the sunnah to follow instead of the pre-Islamic congratulations.
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