Abu Hurayra said, "The Messenger of Allah, may Allah bless him and grant him peace, kissed Hasan ibn 'Ali while al-Aqra' ibn Habis at-Tamimi was sitting with him. Al-Aqra' observed, 'I have ten children and I have never kissed any of them.' The Messenger of Allah, may Allah bless him and grant him peace, looked at him and said, 'Whoever does not show mercy will not be shown mercy.'"