It is narrated from Imam Hasan al-Basri (may Allah have mercy on him) that Sayyiduna Aqil bin Abi Talib (may Allah be pleased with him) married a woman, and it was said to him: "May you have harmony and sons." He said: I heard the Messenger of Allah (peace and blessings be upon him) say: "When one of you marries, let it be said to him: 'May Allah bless you and send blessings upon you.'"
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14584