Musnad Ahmad 31:65

Yahya ibn Ghaylan narrated to us, Rashdin narrated to us, he said: Amr ibn al-Harith narrated to us, from Abu al-Samh, from Abu al-Haytham, from Abu Sa’id al-Khudri: That the Messenger of Allah, peace and blessings of Allah be upon him, said: "The believers in this world are in three parts: Those who believed in Allah and His Messenger, then did not doubt, and strove with their wealth and their selves in the way of Allah; and the one whom people trust with their wealth and their selves; then the one who, when he overlooks a desire, leaves it for the sake of Allah, the Almighty and Majestic."