Chapter: "... (Allah) comes in between a person and his heart"
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."
Reference
Sahih al-Bukhari 6618
In-book reference
Book 82, Hadith 24
USC-MSA web (English)
Vol. 8, Book 77, Hadith 615
Translation by Dr. M. Muhsin Khan · Language: EN
Sahih
Arabic Text
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 ".