(23) The Book on Jihad
كتاب الجهاد عن رسول الله صلى الله عليه وسلم
(18) Chapter: What Has Been Related About The Helmet
(18) باب مَا جَاءَ فِي الْمِغْفَرِ
Jami` at-Tirmidhi 1693 
Narrated Anas bin Malik:

The Prophet (ﷺ) entered (Makkah) during they year of the Conquest, and upon his head was a helmet (Mighfar). It was said to him: 'Ibn Khatal is clinging to the covering of the Ka'bah.' So he said: 'Kill him.'"

[Abu 'Eisa said:] This Hadith is Hasan Sahih Gharib. We do knot know of anyone important who reported it other than Malik from Az-Zuhri.

حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا مَالِكُ بْنُ أَنَسٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ دَخَلَ النَّبِيُّ صلى الله عليه وسلم عَامَ الْفَتْحِ وَعَلَى رَأْسِهِ الْمِغْفَرُ فَقِيلَ لَهُ ابْنُ خَطَلٍ مُتَعَلِّقٌ بِأَسْتَارِ الْكَعْبَةِ ‏.‏ فَقَالَ ‏ "‏ اقْتُلُوهُ ‏"‏ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ لاَ نَعْرِفُ كَبِيرَ أَحَدٍ رَوَاهُ غَيْرَ مَالِكٍ عَنِ الزُّهْرِيِّ ‏.‏
Grade :  Sahih (Darussalam)
Reference : Jami` at-Tirmidhi 1693
In-book reference : Book 23, Hadith 24
English translation : Vol. 3, Book 21, Hadith 1693