The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
Ṣaḥīḥ Muslim 6668
لاَ يُشِيرُ أَحَدُكُمْ إِلَى أَخِيهِ بِالسِّلاَحِ فَإِنَّهُ لاَ يَدْرِي أَحَدُكُمْ لَعَلَّ الشَّيْطَانَ يَنْزِعُ فِي يَدِهِ فَيَقَعُ فِي حُفْرَةٍ مِنَ النَّارِ
lā yushīru aḥadukum ilā akhīhi bi-as-silāḥi fa-innah lā yadrī aḥadukum laʿalla ash-shayṭāna yanziʿu fī yadihi fayaqaʿu fī ḥufratin mina an-nāri
Transliteration generated from the Arabic vowel marks
The full narration
Abu Huraira reported a hadith from Allah's Messenger (ﷺ) ; (one of them was this) that Allah's Messenger (ﷺ) said:None amongst you should point a weapon towards his brother, for he does not know that Satan might cause the weapon (to slip) from his hand and (he may injure anyone) and thus he may fall into Hell-Fire
Source
Ṣaḥīḥ Muslim · 6668