Musannaf Ibn Abi Shayba 21:290

Ubayd ibn Sa'd narrated to us, from Shu'bah, from Ziyad ibn Mikhraq, who said: I heard Qays ibn Sababah, from a freed slave of Sa'd, from Sa'd, who said: I heard the Messenger of Allah (peace and blessings of Allah be upon him) saying: "Indeed, there will be a people who will transgress in supplication."