It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "There are no days in which (good) deeds are more beloved to Allah Almighty than these ten days (the first ten days of Dhu al-Hijjah)." It was said: "Not even jihad in the path of Allah (is equal to them)?" He (peace and blessings be upon him) said: "No, except for a man who goes out with his life and his wealth and then brings none of it back."
Hadith Referenceالمعجم الأوسط / باب الألف / 1756
Hadith Takhrij«أخرجه الطبراني فى «الكبير» برقم: 10455»