Musnad Ahmad 109:1

Musa ibn Dawud narrated to us, Ibn Lahi'ah narrated to us, from Yazid ibn 'Amr, from Abu 'Abd al-Rahman al-Hubuli, from Abu Fatimah al-Azdi, or al-Asadi, who said: The Prophet, may Allah bless him and grant him peace, said to me: "O Abu Fatimah, if you wish to meet me, then increase in prostration."