Musnad Ahmad 28:83

Abu Kamil narrated to us, Zuhayr narrated to us, Ibrahim ibn al-Muhajir narrated to us, from Abdullah ibn Babah, from Abdullah ibn Amr, who said: I was with the Messenger of Allah, peace and blessings of Allah be upon him. He said: Then deeds were mentioned, and he said: "There are no days in which deeds are better than these ten." They said: O Messenger of Allah, not even Jihad in the way of Allah? He said—and he magnified it—: "Nor Jihad, unless a man goes out with his self and his wealth in the way of Allah, then the lifeblood of his soul is spent therein."