Musnad Ahmad 1231:0

It was narrated from Al-Aqra’ ibn Habis that he said: I came to the Messenger of Allah (ﷺ) and said: "O Messenger of Allah, I have never kissed a child of mine, and I have ten children." The Messenger of Allah (ﷺ) looked at him and said: "What can I do for you if Allah has removed mercy from your heart? Whoever does not show mercy will not be shown mercy."