Musannaf Ibn Abi Shayba 21:452

Ghundar narrated to us, from Shu'bah, from Mansur, from 'Abdullah ibn Yasar, from Hudhayfah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Do not say, 'What Allah wills and so-and-so wills,' but say, 'What Allah wills, then so-and-so wills.'"