Self-sacrificingly

Those who consecrate their lives self-sacrificingly to the service of humanity are regarded as the best of men.

Source: wiktionary

Mr. Harrison was smoking on his veranda. His wife had self-sacrificingly told him that he might smoke in the house if he took care to sit by an open window.

Source: wiktionary

At this period, too, he liked to insist more strongly than ever on the altruistic, the self-sacrificingly patriotic character of his whole career.

Source: wiktionary