Abu Amr al-Shaybani said: I used to sit with Sayyiduna Ibn Mas'ud (may Allah be pleased with him) for a year, and he would never say: The Messenger of Allah (peace and blessings be upon him) said. And whenever he did say: The Messenger of Allah (peace and blessings be upon him) said, trembling would come over him, and he would say: "Like this, or something similar, or close to this, or whatever Allah wills."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8581