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."
Jami` at-Tirmidhi Book 11, Hadith 12
← Previous Hadith "The morning after the consummation of my marriage, the Prophet came and sat on my bed as far from me as you are sitting now, and our little girls started beating the Duff and reciting verses mourning my father who had been killed in the battle of Badr. One of them said: 'Among us is a Prophet who knows what will happen tomorrow.' On that the Prophet said: 'Stop saying this, and keep on saying what you were saying before.'"

Jami` at-Tirmidhi Book 11, Hadith 11 Next Hadith → The Messenger of Allah said: "If anyone of you, when having sexual intercourse with his wife, says: (Bismillah, Allahumma jannibnash-Shaitana wa jannibish-Shaitana ma razaqtana) 'In the Name of Allah, O Allah! Protect me from Shaitan and protect what you bestow upon us from Shaitan' - then if Allah decrees that they should have a child, Shaitan will not be able to harm him.'"

Jami` at-Tirmidhi Book 11, Hadith 13