Musnad Ahmad 18:2

Isma'il, who is Ibn 'Ulayyah, narrated to us, [saying]: Yunus informed us, from al-Hasan, that 'Aqil ibn Abi Talib (may Allah be pleased with him) married a woman from Banu Jusham. The people entered upon him and said: "With concord and sons." He said: "Do not say that." They said: "Then what should we say, O Abu Yazid?" He said: "Say: 'May Allah bless you, and may He bestow blessings upon you,' for that is what we were commanded [to say]."