It was narrated from Ibn ‘Abbas that the Messenger of Allah ﷺ said:
“There are no days during which righteous deeds are more beloved to Allah than these days,” meaning the (first) ten days of Dhul- Hijjah. They said: “O Messenger of Allah! Not even Jihad in the cause of Allah?” He said: “Not even Jihad in the cause of Allah, unless a man goes out with himself and his wealth and does not bring anything back.”

حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنِ الأَعْمَشِ، عَنْ مُسْلِمٍ الْبَطِينِ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ ﷺ ـ " مَا مِنْ أَيَّامٍ الْعَمَلُ الصَّالِحُ فِيهَا أَحَبُّ إِلَى اللَّهِ مِنْ هَذِهِ الأَيَّامِ " . يَعْنِي الْعَشْرَ . قَالُوا يَا رَسُولَ اللَّهِ وَلاَ الْجِهَادُ فِي سَبِيلِ اللَّهِ قَالَ " وَلاَ الْجِهَادُ فِي سَبِيلِ اللَّهِ إِلاَّ رَجُلٌ خَرَجَ بِنَفْسِهِ وَمَالِهِ فَلَمْ يَرْجِعْ مِنْ ذَلِكَ بِشَىْءٍ " .