Musannaf Ibn Abi Shayba 9:1309

Abu Bakr narrated to us, he said: Humayd ibn Abd al-Rahman narrated to us, from al-Sari ibn Yahya, from al-Hasan, he said: A man said to another, "With concord and sons." The Messenger of Allah (peace and blessings of Allah be upon him) said: "Do not say it like this, but say: 'May Allah bless you, and may He send blessings upon you.'"