Musannaf Ibn Abi Shayba 36:539

Ibn Numayr narrated to us, from Yahya ibn Sa'id, from al-Qasim, that when Umar was stabbed, the people came praising him and supplicating for him. Umar (may Allah have mercy on him) said: "Are you praising me because of the leadership? I accompanied the Messenger of Allah (may Allah bless him and grant him peace), and he passed away while he was pleased with me. I accompanied Abu Bakr, and I listened and obeyed. Then Abu Bakr passed away while I was listening and obeying. And I have not reached this morning fearing for myself except for this leadership of yours."