Musannaf Ibn Abi Shayba 38:27

'Abdah ibn Sulayman narrated to us, from al-A'mash, from Shahr ibn 'Atiyyah, from 'Abdullah ibn Ziyad, who said: 'Ammar ibn Yasir said: "Indeed, our mother has traveled this journey of ours, and she is, by Allah, the wife of Muhammad, may Allah bless him and grant him peace, in this world and the Hereafter. But Allah has tested us with this, so that He may know whether we obey Him or obey her."