I'm not speaking about that Sahabi which other Sahabas believed to be Dajjal.
I'm talking about the below:
THE HADITH OF FATIMAH BINT QAYS:
'Amir ibn Sharahil Sha'bi Sha'b Hamdan
reported that he asked Fatimah bint Qays, the sister of Dahhak ibn Qays,
who was one of the first Muhajirat, "Tell me a Hadith which you heard
directly from the Prophet with no narrator in between." She said, "I can
tell you if you like." He said, 'Yes, please tell me," she said, "I
married Ibn al-Mughirah, who was one of the best of the youth of Quraysh
in those days. But he fell in the first Jihad on the side of the Prophet.
"When I became a widow, 'Abd al-Rahman ibn 'Awf, one of the companions of
the Prophet sent me a proposal of marriage. The Prophet also sent me a
proposal of marriage on behalf of his freedman Usamah ibn Zayd. I had been
told that the Prophet had said, 'He who loves me should also love Usamah.'
When the Prophet spoke to me, I said, 'It is up to you: marry me to
whomever you wish.'
"The Prophet said, 'Go and stay with Umm Sharik.' Umm Sharik was a rich
Ansari (Muslim originally from Madinah) woman, who spent much in the way
of Allah and entertained many guests. I said, 'I will do as you wish.'
Then he said, 'Don't go. Umm Sharik has many guests, and I would not like
it if your head or leg were to become uncovered accidentally and people
saw something you would not wish them to see. It is better if you go and
stay with your cousin 'Abd Allah ibn 'Amr ibn Umm Maktum' (Abd Allah was
of the Banu Fihr of Quraysh, the same tribe as that to which Fatima
belonged).
"So I went to stay with him, and when I had completed my 'Iddah (perio of
waiting), I heard the Prophet's announer calling for congregational
prayer. I went out to the mosque, and prayed behind the Prophet. I was in
the women's row, which was at the back of the congregation. 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 Dajjal. 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 isvery eager to know about you." So we came to you quickly,
fearinthat 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 Dajjal. 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 Dajjal, 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).