Musnad Ahmad 938:35

Sulayman ibn Dawud narrated to us, Imran narrated to us, from Qatadah, from Anas ibn Malik, from Zayd ibn Thabit: That the Messenger of Allah (peace and blessings of Allah be upon him) looked toward Yemen and said: "O Allah, turn their hearts toward us." And he looked toward such-and-such a direction and said: "O Allah, turn their hearts toward us, and bless for us our sa' and our mudd."