Musnad Ahmad 27:1528

Azhar ibn Sa'd Abu Bakr al-Samman narrated to us, Ibn 'Awn informed us, from Nafi', from Ibn 'Umar, that the Prophet (peace and blessings of Allah be upon him) said: "O Allah, bless us in our Sham; O Allah, bless us in our Yemen." They said: "And in our Najd!" He said: "O Allah, bless us in our Sham; O Allah, bless us in our Yemen." They said: "And in our Najd!" He said: "Therein are the earthquakes and the tribulations, or he said: from it emerges the horn of Satan."