Musnad Abu Ya'la al-Mawsili 42:298

Zuhayr narrated to us, Muhammad bin Mus'ab narrated to us, from al-Awza'i, from al-Zuhri, from 'Ata' bin Yazid al-Laythi, from Abu Sa'id al-Khudri, that a Bedouin came to the Prophet (may Allah bless him and grant him peace) and said: "O Messenger of Allah, I have camels and I wish to perform Hijrah (emigration), so what do you command me?" He said: "Do you give some of them as a gift?" He said: "Yes." He said: "And do you pay their Zakat?" He said: "Yes." He said: "And do you milk them on the day they are watered?" He said: "Yes." He said: "Then go and work from beyond the seas, for Allah will not leave anything of your deeds [unrewarded], and the matter of Hijrah is severe."