Sahih Muslim Book 41, Hadith Number 7031.
Chapter : The Hadith pertaining to the spy of the Dajjal.
Fatima b. Qais reported that Allah’s Messenger (may peace be upon him) sat on the pulpit and said: O people, Tamim Dari has reported to me that some persons of his tribe sailed in the ocean in a boat and it capsized and then some of them travelled on one of the planks of the boat and they went to an island in the ocean. The rest of the hadith is the same.