Rashness: Moses, in Killing the Egyptian

One day, after Moses had grown up, he went out to his own people and observed their hard labor. He saw an Egyptian beating a Hebrew, one of his own people.

After looking this way and that and seeing no one, he struck down the Egyptian and hid his body in the sand.

And when he saw one of them being mistreated, Moses went to his defense and avenged him by striking down the Egyptian who was oppressing him.

He assumed his brothers would understand that God was using him to deliver them, but they did not.