The Prophet ﷺ said, "The son of Adam has done nothing better than prayer, reconciling between people, and good character."
عن النبي ﷺ قال: ما عمل ابن آدم شيئا أفضل من الصلاة، وصلاح ذات البين، وخلق حسن.
No references are available.
Bukhari narrated it in Tarikh al-Kabir (1/63), and from his route Bayhaqi in Shuab (10580), from Sulayman bin Abdul-Rahman, who said, Muhammad bin Hajjaj narrated to us, Yunus bin Maysara bin Halabas narrated to us, from Abu Idris Khawlani, from Abu Hurairah, and he mentioned it.Its chain is hasan because of Muhammad bin Hajjaj, who is the Damascene, a group of narrators reported from him, and Abu Hatim said, "A shaykh," so someone like him has his hadith graded hasan when he does not bring something objectionable. Sulayman bin Abdul-Rahman is Ibn Isa Tamimi Damascene, whose hadith is also hasan.