Sayyiduna Ibn Umar (may Allah be pleased with them both) said: "In the presence of the Messenger of Allah (peace and blessings be upon him) and his Companions, we used to count: Abu Bakr, then Umar, then Uthman, then we would fall silent."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13244