Abu Bakr kissed the Prophet ﷺ after his death.
أن أبا بكر رضي الله عنه قبل النبي ﷺ بعد موته.
No references are available.
Bukhari narrated it in "The Military Expeditions" (4455-4457) from Abdullah bin Abu Shayba, who said, Yahya bin Saeed narrated to us, from Sufyan, from Musa bin Abu Ayesha, from Ubaydullah bin Abdullah bin Utba, from Ayesha and Ibn Abbas, who both said, and then mentioned it.