Regarding The Appointment Of The Khalifah Sunan Abi Dawud 2939

Arabic hadith text
حَدَّثَنَا مُحَمَّدُ بْنُ دَاوُدَ بْنِ سُفْيَانَ، وَسَلَمَةُ، قَالاَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ عُمَرُ إِنِّي إِنْ لاَ أَسْتَخْلِفْ فَإِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم لَمْ يَسْتَخْلِفْ وَإِنْ أَسْتَخْلِفْ فَإِنَّ أَبَا بَكْرٍ قَدِ اسْتَخْلَفَ ‏.‏ قَالَفَوَاللَّهِ مَا هُوَ إِلاَّ أَنْ ذَكَرَ رَسُولَ اللَّهِ صلى الله عليه وسلم وَأَبَا بَكْرٍ فَعَلِمْتُ أَنَّهُ لاَ يَعْدِلُ بِرَسُولِ اللَّهِ صلى الله عليه وسلم أَحَدًا وَأَنَّهُ غَيْرُ مُسْتَخْلِفٍ
Translation
Narrated Ibn 'Umar

'Umar said: "If I do not appoint a successor—for the Messenger of Allah (ﷺ) did not appoint a successor; and if I appoint a successor—then Abu Bakr did appoint a successor." He said: By Allah, he merely mentioned the Messenger of Allah (ﷺ) and Abu Bakr, and I knew that he would not equate anyone with the Messenger of Allah (ﷺ), and that he would not appoint a successor.