Bukhari

Narrated Ibn `Abbas: The Prophet 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 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."

And Ibn Abbas (may Allah be pleased with them both) said that in (the verse) "And remember Allah during the appointed days," the "appointed days" refer to the ten days of Dhul-Hijjah, and «اأيام المعدودات» refers to the days of Tashreeq. Ibn Umar and Abu Huraira (may Allah be pleased with them both) used to go out to the marketplace during these ten days, and when people heard their takbeer (proclamation of Allah's greatness), they would also say the takbeer. And Muhammad bin Baqir (may Allah have mercy on him) used to say the takbeer even after voluntary prayers.

And Ibn Abbas (may Allah be pleased with them both) said that in (the verse) "And remember Allah during the appointed days," the "appointed days" refer to the ten days of Dhul-Hijjah, and «اأيام المعدودات» refers to the days of Tashreeq. Ibn Umar and Abu Huraira (may Allah be pleased with them both) used to go out to the marketplace during these ten days, and when people heard their takbeer (proclamation of Allah's greatness), they would also say the takbeer. And Muhammad bin Baqir (may Allah have mercy on him) used to say the takbeer even after voluntary prayers.

Narrated Ibn `Abbas: The Prophet 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 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."