Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tabarani:14641 – [Chain 1] al-Miqdām b. Dāwud > Asad b. Mūsá [Chain 2] Abū Muslim al-Kashhī > Abū ʿUmar al-Ḍarīr > Abū Hilāl al-Rāsibī > al-Ḥasan > ʿAqīl b. Abū Ṭālib Tazawwaj Āmraʾah Faqīl Lah Bi-al-Rrifāʾ And al-Banīn

[Machine] "I heard the Messenger of Allah ﷺ say, 'When one of you gets married, let him say to him, 'May Allah bless you and bestow His blessings upon you.'"  

الطبراني:١٤٦٤١ – حَدَّثَنَا الْمِقْدَامُ بْنُ دَاوُدَ ثَنَا أَسَدُ بْنُ مُوسَى ح وَحَدَّثَنَا أَبُو مُسْلِمٍ الْكَشِّيُّ ثَنَا أَبُو عُمَرَ الضَّرِيرُ قَالَا ثَنَا أَبُو هِلَالٍ الرَّاسِبِيُّ عَنِ الْحَسَنِ أَنَّ عَقِيلَ بْنَ أَبِي طَالِبٍ تَزَوَّجَ امْرَأَةً فَقِيلَ لَهُ بِالرِّفَاءِ وَالْبَنِينَ قَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ إِذَا تَزَوَّجَ أَحَدُكُمْ فَلْيُقَلْ لَهُ بَارَكَ اللهُ لَكَ وَبَارَكَ عَلَيْكَ  

See similar narrations below:

Collected by Suyūṭī