بُلُوغُ الْمَرَامِ
Bulugh al-Maram 972
Marriage
وَعَنْهُ ; أَنَّ اَلنَّبِيَّ - صلى الله عليه وسلم -كَانَ إِذَا رَفَّأَ إِنْسَانًا إِذَا تَزَوَّجَ قَالَ : { بَارَكَ اَللَّهُ لَكَ , وَبَارَكَ عَلَيْكَ , وَجَمَعَ بَيْنَكُمَا فِي خَيْرٍ } رَوَاهُ أَحْمَدُ , وَالْأَرْبَعَةُ , وَصَحَّحَهُ اَلتِّرْمِذِيُّ , وَابْنُ خُزَيْمَةَ , وَابْنُ حِبَّانَ [1] .
Narrated [Abu Hurairah (RA)]: When the Prophet (ﷺ) congratulated a man on his marriage he would say, "Allah bless for you (your spouse), grant you blessing, and join you together in goodness." [Reported by Ahmad and al-Arba'a. at-Tirmidhi, Ibn Khuzaimah and Ibn Hibban graded it Sahih (authentic)].
Sunnah.com reference: Book 8, Hadith 6