the Prophet saw traces of yellow perfume on 'Abdur-Rahmaan bin 'Awf, and he asked him “What is this?” He said: “O Messenger of Allah, I married a women for the weight of a Nawah (Stone) of gold. He said: “May Allah bless you. Give a feast even if it is only with one sheep.” (Using translation from Ibn Mājah 1907)   

أَنَّ رَسُولَ اللهِ ﷺ رَأَى عَلَى عَبْدِ الرَّحْمَنِ أَثَرَ صُفْرَةٍ فَقَالَ مَا هَذَا يَا أَبَا مُحَمَّدٍ؟ قَالَ تَزَوَّجْتُ امْرَأَةً عَلَى وَزْنِ نَوَاةٍ مِنْ ذَهَبٍ قَالَ بَارَكَ اللهُ لَكَ أَوْلِمْ وَلَوْ بِشَاةٍ أَخْرَجَاهُ فِي الصَّحِيحِ مِنْ حَدِيثِ حَمَّادِ بْنِ زَيْدٍ  

[Machine] The Prophet ﷺ used to say when someone got married, "May Allah bless you and bless your marriage and bring goodness and harmony between you." And in another narration, it is mentioned that the Prophet ﷺ said, "When a man gets married and is congratulated, he should mention him (i.e. the Prophet Muhammad)."  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا رَفَأَ الْإِنْسَانَ إِذَا تَزَوَّجَ قَالَ بَارَكَ اللهُ لَكَ وَبَارَكَ عَلَيْكَ وَجَمَعَ بَيْنَكُمَا فِي خَيْرٍ وَفِي رِوَايَةِ الْمُقْرِئِ قَالَ كَانَ النَّبِيُّ ﷺ إِذَا تَزَوَّجَ رَجُلٌ فَرَفَأَهُ قَالَ فَذَكَرَهُ  

[Machine] "Do not say that, for the Messenger of Allah ﷺ has forbidden us from doing so and has commanded us to say 'May Allah bless you' and 'May Allah bless upon you.'"  

لَا تَقُولُوا كَذَلِكَ فَإِنَّ رَسُولَ اللهِ ﷺ نَهَى عَنْ ذَلِكَ وَأَمَرَنَا أَنْ نَقُولَ بَارَكَ اللهُ لَكَ وَبَارَكَ عَلَيْكَ