Blessings in marriage are necessary to keep any marriage forever and the best dua to get blessings in marriage is “Barakallahu Lakuma Wa Baraka Alaikuma wa jama baynakuma Fi khair”. This is a masnoon Dua and there is a clear hadith about this Dua. In Sunan Abi Dawud Hadith 2130, Hazrat Abu Huraira said that when the Holy Prophet (صلی اللہ علیہ وسلم) congratulated someone on their marriage, at that time he used to say “Barakallahu Lakuma Wa Baraka Alaikuma wa jama baynakuma Fi khair”. By reciting this dua, married people get blessings due to which their marriage lasts forever. Therefore, it is preferable to recite this dua once after seeing any marriage or after congratulating someone on marriage.