A companion of the Prophet Muhammad encountered Moshiach of Zionists and The Twelth Imam of Shiites on an island

When the Prophet had finished his prayer, he sat on the pulpit, smiling, and said,'Everyone should stay in his place.' Then he said, 'Do you know why I had asked you to assemble?' The people said, 'Allah and His Messenger know best.' "He said, 'By Allah, I have not gathered you here to give you an exhortation or a warning. I have kept you here because Tamim al-Dari, a Christian man who has come and embraced Islam, told me something which agrees with that which I have told you about the Antichrist. He told me that he had sailed in a ship with 30 men from Banu Lakhm and Banu Judham. The waves had tossed them about for a month, then they were brought near to an island, at the time of sunset. They landed on the island, and were met by a beast who was so hairy that they could not tell its front from its back.
They said, "Woe to you! What are you?" It said, "I am al-Jassasah." They said, "What is al-Jassasah?" It said, "O people, go to this man in the monastery, for he is very eager to know about you." Tamim said that when it named a person to us, we were afraid lest it be a devil. "Tamim said, 'We quickly went to the monastery. There we found a huge man with his hands tied up to his neck and with iron shackles between his legs up to the ankles. We said, "Woe to you, who are you?" He said, "You will soon know about me. Tell me who you are." We said, "We are people from Arabia. We sailed in a ship, but the waves have been tossing us about for a month, and they brought us to your island, where we met a beast who was so hairy that we could not tell its front from its back. We said to it,"Woe to you! What are you? and it said , "I am al-Jassasah." We asked, "What is al-Jassasah?" and it told us, "Go to this man in the monastery, for he is very eager to know about you." So we came to you quickly, fearing that it might be a devil.' "The man said, "Tell me about the date-palms of Baysan.' We said, 'What do you want to know about them?" He said, 'I want to know whether these trees bear fruit or not.' We said, 'Yes.' He said, 'Soon they will not bear fruit.' Then he said, "Tell me about the lake of al-Tabariyyah [Tiberias, in Palestine].' We said, 'What do you want to know about it?" He asked, 'Is there water in it?' We said, 'There is plenty of water in it.' He said, 'Soon it will become dry.' Then he said, 'Tell me about the spring of Zughar.' We said, 'What do you want to know about it?' He said, 'Is there water in it, and does it irrigate the land?" We said, 'Yes, there is plenty of water in it, and the people use it to irrigate the land.' "Then he said, "Tell me about the unlettered Prophet 'what has he done?' We said, 'He has left Makkah and settled in Yathrib.' He asked, 'Do the Arabs fight against him?' We said, 'Yes.' He said, 'How does he deal with them?' So we told him that the Prophet had overcome the Arabs around him and that they had followed him. He asked, 'Has it really happened?' We said, 'Yes.' He said, 'It is better for them if they follow him. Now I will tell you about myself. I am the Messiah. I will soon be permitted to leave this place: I will emerge and travel about the earth. In 40 nights I will pass through every town, except Makkah and Madinah, for these have been forbidden to me. Every time I try to enter either of them, I will be met by an angel bearing an unsheathed sword, who will prevent me from entering. There will be angels guarding them at every passage leading to them.' Fatimah said, "The Prophet striking the pulpit with his staff, said: 'This is Tayyibah, this is Tayyibah, this is Tayyibah, [ie Madinah]. Have I not told you something like this?' The people said, 'Yes.' He said, 'I liked the account given to me by Tamim because it agrees with that which I have told you about the Antichrist, and about Makkah and Madinah. Indeed he is in the Syrian sea or the Yemen sea. No, on the contrary, he is in the East, he is in the East, he is in the East' and he pointed towards the East. Fatimah said: I memorised this from the Prophet." (Muslim).

Sources:
Dajjal: AWAITS ON THE ISLAND IN THE EAST
"Inform me of the lake of Tiberias."