When supplicating for the newlywed, the Prophet would say: (Barak Allahu laka wa baraka alaik, wa jama'a bainakuma fi khair.) "May Allah bless you and send blessings upon you, and bring goodness between you."
Reference: Jami` at-Tirmidhi 1091 In-book : Book 11, Hadith 12 English translation : Vol. 2, Book 6, Hadith 1091
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