Sahih al-Bukhari 6618

Arabic

حَدَّثَنَا عَلِيُّ بْنُ حَفْصٍ، وَبِشْرُ بْنُ مُحَمَّدٍ، قَالاَ أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم لاِبْنِ صَيَّادٍ ‏"‏ خَبَأْتُ لَكَ خَبِيئًا ‏"‏‏.‏ قَالَ الدُّخُّ‏.‏ قَالَ ‏"‏ اخْسَأْ فَلَنْ تَعْدُوَ قَدْرَكَ ‏"‏‏.‏ قَالَ عُمَرُ ائْذَنْ لِي فَأَضْرِبَ عُنُقَهُ‏.‏ قَالَ ‏"‏ دَعْهُ، إِنْ يَكُنْ هُوَ فَلاَ تُطِيقُهُ، وَإِنْ لَمْ يَكُنْ هُوَ فَلاَ خَيْرَ لَكَ فِي قَتْلِهِ ‏"‏‏.‏

Translation

Narrated Ibn `Umar:The Prophet (ﷺ) said to Ibn Saiyad, "I have kept for you a secret." Ibn Saiyad said, "Ad-Dukh." The Prophet said, "Keep quiet, for you cannot go beyond your limits (or you cannot exceed what has been foreordained for you)." On that, `Umar said (to the Prophet (ﷺ) ), "Allow me to chop off his neck!" The Prophet said, "Leave him, for if he is he (i.e., Ad-Dajjal), then you will not be able to overcome him, and if he is not, then you gain no good by killing him

Authenticity

Sahih

Reference