Narrated 'Abdullah bin 'Umar:

It was said to 'Umar, "Will you appoint your successor?" Umar said, "If I appoint a Caliph (as my successor) it is true that somebody who was better than I (i.e., Abu Bakr) did so, and if I leave the matter undecided, it is true that somebody who was better than I (i.e., Allah's Apostle) did so." On this, the people praised him. 'Umar said, "People are of two kinds: Either one who is keen to take over the Caliphate or one who is afraid of assuming such a responsibility. I wish I could be free from its responsibility in that I would receive neither reward nor retribution I won't bear the burden of the caliphate in my death as I do in my life."

حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، أَخْبَرَنَا سُفْيَانُ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ قِيلَ لِعُمَرَ أَلاَ تَسْتَخْلِفُ قَالَ إِنْ أَسْتَخْلِفْ فَقَدِ اسْتَخْلَفَ مَنْ هُوَ خَيْرٌ مِنِّي أَبُو بَكْرٍ، وَإِنْ أَتْرُكْ فَقَدْ تَرَكَ مَنْ هُوَ خَيْرٌ مِنِّي رَسُولُ اللَّهِ ﷺ فَأَثْنَوْا عَلَيْهِ فَقَالَ رَاغِبٌ رَاهِبٌ، وَدِدْتُ أَنِّي نَجَوْتُ مِنْهَا كَفَافًا لاَ لِي وَلاَ عَلَىَّ لاَ أَتَحَمَّلُهَا حَيًّا وَمَيِّتًا.