Sahih al-Bukhari 13:18
Narrated Ibn `Abbas:
The Prophet (ﷺ) said, "No good deeds done on other days are superior to those done on these (first ten days of Dhul Hijja)." Then some companions of the Prophet (ﷺ) said, "Not even Jihad?" He replied, "Not even Jihad, except that of a man who does it by putting himself and his property in danger (for Allah's sake) and does not return with any of those things."
Reference
Sahih al-Bukhari 13:18
In-book reference
Book 13, Hadith 18
Arabic Text
حَدَّثَنَا مُحَمَّدُ بْنُ عَرْعَرَةَ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ سُلَيْمَانَ، عَنْ مُسْلِمٍ الْبَطِينِ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ قَالَ " مَا الْعَمَلُ فِي أَيَّامِ الْعَشْرِ أَفْضَلَ مِنَ الْعَمَلِ فِي هَذِهِ ". قَالُوا وَلاَ الْجِهَادُ قَالَ " وَلاَ الْجِهَادُ، إِلاَّ رَجُلٌ خَرَجَ يُخَاطِرُ بِنَفْسِهِ وَمَالِهِ فَلَمْ يَرْجِعْ بِشَىْءٍ ".