Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "There are no days in which drawing near to Allah through a deed is better than in these ten days." It was asked: Not even jihad? He said: "Not even jihad, except for a man who goes out for jihad with his life and his wealth and then brings none of it back."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12383