“The Messenger of Allah ﷺ said to Abu Bakr: ‘When do you pray Witr?’ He said: ‘At the beginning of the night, after ‘Isha’.’ He said: ‘And you, O ‘Umar?’ He said: ‘At the end of the night.’ The Prophet ﷺ said: ‘As for you, O Abu Bakr, you have seized the trustworthy handhold (i.e., you want to be on the safe side), and as for you, O ‘Umar, you have seized strength (i.e., you are confident that you have the resolve to get up and pray Witr).’” Another chain with similar meaning.  

رَسُولُ اللَّهِ ﷺ لأَبِي بَكْرٍ أَىَّ حِينٍ تُوتِرُ قَالَ أَوَّلَ اللَّيْلِ بَعْدَ الْعَتَمَةِ قَالَ فَأَنْتَ يَا عُمَرُ فَقَالَ آخِرَ اللَّيْلِ فَقَالَ النَّبِيُّ ﷺ أَمَّا أَنْتَ يَا أَبَا بَكْرٍ فَأَخَذْتَ بِالْوُثْقَى وَأَمَّا أَنْتَ يَا عُمَرُ فَأَخَذْتَ بِالْقُوَّةِ حَدَّثَنَا أَبُو دَاوُدَ سُلَيْمَانُ بْنُ تَوْبَةَ أَنْبَأَنَا مُحَمَّدُ بْنُ عَبَّادٍ حَدَّثَنَا يَحْيَى بْنُ سُلَيْمٍ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ أَنَّ النَّبِيَّ ﷺ قَالَ لأَبِي بَكْرٍ فَذَكَرَ نَحْوَهُ