'Abdullah reported: We were walking with Messenger of Allah ﷺ that Ibn Sayyad happened to pass by him. Messenger of Allah ﷺ said to him: I have concealed for you (something to test you, so tell me that). He said: It is Dukh. Thereupon Messenger of Allah ﷺ said to him: Be off. You cannot get farther than your rank, whereupon 'Umar said: Allah's Messenger, permit me to strike his neck. Thereupon Messenger of Allah ﷺ said: Leave him; if he is that one (Dajjal) whom you apprehend, you will not be able to kill him.

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ، وَأَبُو كُرَيْبٍ - وَاللَّفْظُ لأَبِي كُرَيْبٍ - قَالَ ابْنُ نُمَيْرٍ حَدَّثَنَا وَقَالَ الآخَرَانِ، أَخْبَرَنَا أَبُو مُعَاوِيَةَ، حَدَّثَنَا الأَعْمَشُ، عَنْ شَقِيقٍ، عَنْ عَبْدِ اللَّهِ، قَالَ كُنَّا نَمْشِي مَعَ النَّبِيِّ ﷺ فَمَرَّ بِابْنِ صَيَّادٍ فَقَالَ لَهُ رَسُولُ اللَّهِ ﷺ " قَدْ خَبَأْتُ لَكَ خَبِيئًا " . فَقَالَ دُخٌّ . فَقَالَ رَسُولُ اللَّهِ ﷺ " اخْسَأْ فَلَنْ تَعْدُوَ قَدْرَكَ " . فَقَالَ عُمَرُ يَا رَسُولَ اللَّهِ دَعْنِي فَأَضْرِبَ عُنُقَهُ فَقَالَ رَسُولُ اللَّهِ ﷺ " دَعْهُ فَإِنْ يَكُنِ الَّذِي تَخَافُ لَنْ تَسْتَطِيعَ قَتْلَهُ " .