Sayyiduna Abu Hurayrah (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) said: "While I was asleep, the treasures of the earth were brought to me, and two gold bracelets were placed on my hands. They became heavy upon me, and it was revealed to me that I should blow on them. I blew on them and they went away. I interpreted this to mean that in my own time there would be those two liars: one the man of San'a' and the other the man of Yamamah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16726