Narrated 'Abdullah bin 'Umar:

'Umar bin Al-Khattab set out with Allah's Apostle, and a group of his companions to Ibn Saiyad. They found him playing with the boys in the fort or near the Hillocks of Bani Maghala. Ibn Saiyad was nearing his puberty at that time, and he did not notice the arrival of the Prophet till Allah's Apostle stroked him on the back with his hand and said, "Do you testify that I am Allah's Apostle?" Ibn Saiyad looked at him and said, "I testify that you are the Apostle of the unlettered ones (illiterates)". Then Ibn Saiyad said to the Prophets . "Do you testify that I am Allah's Apostle?" The Prophet denied that, saying, "I believe in Allah and all His Apostles," and then said to Ibn Saiyad, "What do you see?" Ibn Saiyad said, "True people and liars visit me." The Prophet ﷺ said, "You have been confused as to this matter." Allah's Apostle added, "I have kept something for you (in my mind)." Ibn Saiyad said, "Ad-Dukh." The Prophet ﷺ said, "Ikhsa (you should be ashamed) for you can not cross your limits." 'Umar said, "O Allah's Apostle! Allow me to chop off h is neck." Allah's Apostle ﷺ said (to Umar). "Should this person be him (i.e. Ad-Dajjal) then you cannot over-power him;
and should he be someone else, then it will be no use your killing him." 'Abdullah bin 'Umar added: Later on Allah's Apostle and Ubai bin Ka'b Al-Ansari (once again) went to the garden in which Ibn Saiyad was present. When Allah's Apostle entered the garden, he started hiding behind the trunks of the date-palms intending to hear something from Ibn Saiyad before the latter could see him. Ibn Saiyad was Lying on his bed, covered with a velvet sheet from where his mumur were heard. Ibn Saiyad's mother saw the Prophet and said, "O Saf (the nickname of Ibn Saiyad)! Here is Muhammad!" Ibn Saiyad stopped his murmuring. The Prophet ﷺ said, "If his mother had kept quiet, then I would have learnt more about him." 'Abdullah added: Allah's Apostle stood up before the people (delivering a sermon), and after praising and glorifying Allah as He deserved, he mentioned the Ad-Dajjal saying, "I warn you against him, and there has been no prophet but warned his followers against him. Noah warned his followers against him but I am telling you about him, something which no prophet has told his people of, and that is: Know that he is blind in one eye where as Allah is not so."

حَدَّثَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنِي سَالِمُ بْنُ عَبْدِ اللَّهِ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، أَخْبَرَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ انْطَلَقَ مَعَ رَسُولِ اللَّهِ ﷺ فِي رَهْطٍ مِنْ أَصْحَابِهِ قِبَلَ ابْنِ صَيَّادٍ، حَتَّى وَجَدَهُ يَلْعَبُ مَعَ الْغِلْمَانِ فِي أُطُمِ بَنِي مَغَالَةَ، وَقَدْ قَارَبَ ابْنُ صَيَّادٍ يَوْمَئِذٍ الْحُلُمَ، فَلَمْ يَشْعُرْ حَتَّى ضَرَبَ رَسُولُ اللَّهِ ﷺ ظَهْرَهُ بِيَدِهِ ثُمَّ قَالَ " أَتَشْهَدُ أَنِّي رَسُولُ اللَّهِ ". فَنَظَرَ إِلَيْهِ فَقَالَ أَشْهَدُ أَنَّكَ رَسُولُ الأُمِّيِّينَ. ثُمَّ قَالَ ابْنُ صَيَّادٍ أَتَشْهَدُ أَنِّي رَسُولُ اللَّهِ فَرَضَّهُ النَّبِيُّ ﷺ ثُمَّ قَالَ " آمَنْتُ بِاللَّهِ وَرُسُلِهِ ". ثُمَّ قَالَ لاِبْنِ صَيَّادٍ " مَاذَا تَرَى ". قَالَ يَأْتِينِي صَادِقٌ وَكَاذِبٌ. قَالَ رَسُولُ اللَّهِ ﷺ " خُلِّطَ عَلَيْكَ الأَمْرُ ". قَالَ رَسُولُ اللَّهِ ﷺ " إِنِّي خَبَأْتُ لَكَ خَبِيئًا ". قَالَ هُوَ الدُّخُّ. قَالَ " اخْسَأْ، فَلَنْ تَعْدُوَ قَدْرَكَ ". قَالَ عُمَرُ يَا رَسُولَ اللَّهِ أَتَأْذَنُ لِي فِيهِ أَضْرِبْ عُنُقَهُ. قَالَ رَسُولُ اللَّهِ ﷺ " إِنْ يَكُنْ هُوَ لاَ تُسَلَّطُ عَلَيْهِ، وَإِنْ لَمْ يَكُنْ هُوَ فَلاَ خَيْرَ لَكَ فِي قَتْلِهِ ". قَالَ سَالِمٌ فَسَمِعْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ، يَقُولُ انْطَلَقَ بَعْدَ ذَلِكَ رَسُولُ اللَّهِ ﷺ وَأُبَىُّ بْنُ كَعْبٍ الأَنْصَارِيُّ يَؤُمَّانِ النَّخْلَ الَّتِي فِيهَا ابْنُ صَيَّادٍ، حَتَّى إِذَا دَخَلَ رَسُولُ اللَّهِ ﷺ طَفِقَ رَسُولُ اللَّهِ ﷺ يَتَّقِي بِجُذُوعِ النَّخْلِ، وَهْوَ يَخْتِلُ أَنْ يَسْمَعَ مِنِ ابْنِ صَيَّادٍ شَيْئًا قَبْلَ أَنْ يَرَاهُ، وَابْنُ صَيَّادٍ مُضْطَجِعٌ عَلَى فِرَاشِهِ فِي قَطِيفَةٍ لَهُ فِيهَا رَمْرَمَةٌ أَوْ زَمْزَمَةٌ، فَرَأَتْ أُمُّ ابْنِ صَيَّادٍ النَّبِيَّ ﷺ وَهْوَ يَتَّقِي بِجُذُوعِ النَّخْلِ، فَقَالَتْ لاِبْنِ صَيَّادٍ أَىْ صَافِ ـ وَهْوَ اسْمُهُ ـ هَذَا مُحَمَّدٌ. فَتَنَاهَى ابْنُ صَيَّادٍ. قَالَ رَسُولُ اللَّهِ ﷺ " لَوْ تَرَكَتْهُ بَيَّنَ ". قَالَ سَالِمٌ قَالَ عَبْدُ اللَّهِ قَامَ رَسُولُ اللَّهِ ﷺ فِي النَّاسِ فَأَثْنَى عَلَى اللَّهِ بِمَا هُوَ أَهْلُهُ، ثُمَّ ذَكَرَ الدَّجَّالَ فَقَالَ " إِنِّي أُنْذِرُكُمُوهُ، وَمَا مِنْ نَبِيٍّ إِلاَّ وَقَدْ أَنْذَرَ قَوْمَهُ، لَقَدْ أَنْذَرَهُ نُوحٌ قَوْمَهُ، وَلَكِنِّي سَأَقُولُ لَكُمْ فِيهِ قَوْلاً لَمْ يَقُلْهُ نَبِيٌّ لِقَوْمِهِ، تَعْلَمُونَ أَنَّهُ أَعْوَرُ، وَأَنَّ اللَّهَ لَيْسَ بِأَعْوَرَ ".قَالَ أَبُو عَبْد اللَّهِ خَسَأْتُ الْكَلْبَ بَعَّدْتُهُ خَاسِئِينَ مُبْعَدِينَ