'Umar said: I shall not appoint a successor, for the Messenger of Allah ﷺ did not appoint a successor. If I appoint a successor (I can do so), for Abu Bakr had appointed a successor. He Ibn 'Umar) said: I swear by Allah, he did not mention (anyone) but the Messenger of Allah ﷺ and Abu Bakr. So I learnt he would not equate anyone with the Messenger of Allah ﷺ, for he did not appoint any successor.  

عُمَرُ إِنِّي إِنْ لاَ أَسْتَخْلِفْ فَإِنَّ رَسُولَ اللَّهِ ﷺ لَمْ يَسْتَخْلِفْ وَإِنْ أَسْتَخْلِفْ فَإِنَّ أَبَا بَكْرٍ قَدِ اسْتَخْلَفَ قَالَ فَوَاللَّهِ مَا هُوَ إِلاَّ أَنْ ذَكَرَ رَسُولَ اللَّهِ ﷺ وَأَبَا بَكْرٍ فَعَلِمْتُ أَنَّهُ لاَ يَعْدِلُ بِرَسُولِ اللَّهِ ﷺ أَحَدًا وَأَنَّهُ غَيْرُ مُسْتَخْلِفٍ