Abu Dawud Book 8, Hadith Number 2522.
Chapter : Not known.
Narated By Abdullah ibn Amr ibn al-‘As : A man came to the Apostle of Allah (PBUH) and said: I came to you to take the oath of allegiance to you on emigration, and I left my parents weeping. He (the Prophet) said: Return to them and make them laugh as you made them weep.