Musnad Ahmad 30:1130

The Messenger of Allah, may Allah bless him and grant him peace, said: "While I was sleeping, I was brought the treasures of the earth, and two bracelets of gold were placed in my hands. They became heavy upon me and distressed me. It was revealed to me: 'Blow upon them.' So I blew upon them, and they vanished. I interpreted them as the two liars who are between me: the master of Sana'a and the master of Yamama."