Jihad (Kitab Al-Jihad)
Dawud :: Book 14 : Hadith 2752
Narrated AbuRafi':
The Quraysh sent me to the Apostle of Allah (peace_be_upon_him), and when I saw the Apostle of Allah (peace_be_upon_him), Islam was cast into my heart, so I said: Apostle of Allah, I swear by Allah, I shall never return to them. The Apostle of Allah (peace_be_upon_him) replied: I do not break a covenant or imprison messengers, but return, and if you feel the same as you do just now, come back. So I went away, and then came to the Prophet (peace_be_upon_him) and accepted Islam.