Musnad Ahmad 30:1836

Qutaybah ibn Sa'id narrated to us, 'Abd al-'Aziz ibn Muhammad narrated to us, from Suhayl ibn Abi Salih, from his father, from Abu Hurayrah, that the Prophet, peace and blessings of Allah be upon him, used to, when he congratulated a person when he got married, say: "May Allah bless for you, and may He send blessings upon you, and may He bring you both together in goodness."