It was narrated from Ibn ‘Abbas and ‘Aishah that Abu Bakr kissed the Prophet (ﷺ) when he died.
Sunan Ibn Majah Book 6, Hadith 25
← Previous Hadith “The Messenger of Allah (ﷺ) kissed ‘Uthman bin Maz’un when he had died, and it is as if I can see him with his tears flowing down his cheeks.”

Sunan Ibn Majah Book 6, Hadith 24 Next Hadith → “The Messenger of Allah (ﷺ) entered upon us when we were washing his daughter Umm Kulthum. He said: ‘Wash her three or five times, or more than that if you think you need to, with water and lote leaves, and put camphor or a little camphor in (the water) for the last washing. When you have finished, call for me.’ When we finished, we called him, and he gave his waist-wrapper to us and said: ‘Shroud her with it.’”

Sunan Ibn Majah Book 6, Hadith 26