Hadith 6061
وَعَنْ حُذَيْفَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِنِّي لَا أَدْرِي مَا بَقَائِي فِيكُمْ؟ فَاقْتَدُوا بِاللَّذَيْنِ مِنْ بَعْدِي: أَبِي بكر وَعمر . رَوَاهُ التِّرْمِذِيّ
Hudhaifa reported God's messenger as saying, "I do not know how long I shall remain among you, so copy those two who will remain after I am gone, Abu Bakr and `Umar." Tirmidhi transmitted it.