that Abu Bakr kissed the Prophet between the eyes when he had died. (Using translation from Nasāʾī 1839)  

أَنَّ أَبَا بَكْرٍ «قَبَّلَ بَيْنَ عَيْنَيِ النَّبِيِّ ﷺ وَهُوَ مَيِّتٌ»  

It was narrated from Ibn ‘Abbas and ‘Aishah that Abu Bakr kissed the Prophet ﷺ when he died. (Using translation from Ibn Mājah 1457)  

أَنَّ أَبَا بَكْرٍ «قَبَّلَ النَّبِيَّ ﷺ وَهُوَ مَيِّتٌ»  

Abu Bakr came riding a horse from his home in As-Sunuh, then he dismounted and entered the Masjid. He did not speak to the people until he met 'Aishah and the Messenger of Allah was covered with a Hibrah Burd. He uncovered his face, bent over him and kissed him, and wept. Then he said: "May my father be ransomed for you. By Allah! Allah will never cause you to die twice; the death that was decreed for you, you have died." (Using translation from Nasāʾī 1841)  

أَنَّ أَبَا بَكْرٍ أَقْبَلَ عَلَى فَرَسٍ مِنْ مَسْكَنِهِ بِالسُّنْحِ حَتَّى نَزَلَ فَدَخَلَ الْمَسْجِدَ فَلَمْ يُكَلِّمِ النَّاسَ حَتَّى دَخَلَ عَلَى عَائِشَةَ فَيَمَّمَ رَسُولَ اللهِ ﷺ مُسَجًّى بِبُرْدٍ حِبَرَةٍ فَكَشَفَ عَنْ وَجْهِهِ ثُمَّ أَكَبَّ عَلَيْهِ فَقَبَّلَهُ فَبَكَى ثُمَّ قَالَ «بِأَبِي أَنْتَ وَاللهِ لَا يَجْمَعُ اللهُ عَلَيْكَ مَوْتَتَيْنِ أَبَدًا أَمَّا الْمَوْتَةُ الَّتِي كَتَبَهَا اللهُ عَلَيْكَ فَقَدْ مُتَّهَا»