Take the White Helmets, for example. The White Helmets were a group of rescuers in Syria. The White Helmets went out after bombs were dropped so they can save the injured people. They risk their lives for others because they think about them first. This sacrifice that the White Helmets are making can even lead themselves to death.
Furthermore, Harriet Tubman also risked her life so that others didn’t have to go through something rough. She was a slave that escaped from slavery so that she could become a leading abolitionist.