Musnad Ahmad 27:1604

Yunus narrated to us, Hammad—meaning Ibn Zayd—narrated to us, Bishr informed us, I heard Ibn Umar saying: I heard the Messenger of Allah, may Allah bless him and grant him peace, saying: "O Allah, bless for us our Medina, and bless for us our Sham, and bless for us our Yemen, and bless for us in our sa', and bless for us in our mudd."