Musnad Ahmad 27:1192

Abu Abd al-Rahman narrated to us, Sa'id narrated to us, Abd al-Rahman ibn 'Ata' narrated to us, from Nafi', from Ibn Umar, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "O Allah, bless for us our Sham and our Yemen," twice. A man said: "And our East, O Messenger of Allah?" The Messenger of Allah (peace and blessings of Allah be upon him) said: "From there rises the horn of Satan, and in it are nine-tenths of evil."