The Prophet ﷺ said, "Whoever does not show mercy to people, Allah will not show mercy to him."
حدثنا معاوية حدثنا شيبان عن فراس عن عطية
عن النبي ﷺ قال إن من لا يرحم الناس لا يرحمه الله
No references are available.
Its chain of transmission is hasan. It includes Atiya, and the hadith is in the Sahihs and has already appeared at 10621.