Nearly everyone knows how Moses freed the Israelites from Egyptian slavery. Not many know that Moses had made a previous attempt to free them and had failed.
One day, when Moses had grown up, he went out to his people and looked on their burdens, and he saw an Egyptian beating a Hebrew, one of his people. He looked this way and that, and seeing no one, he struck down the Egyptian and hid him in the sand.
When he went out the next day, behold, two Hebrews were struggling together. And he said to the man in the wrong, “Why do you strike your companion?”
He answered, “Who made you a prince and a judge over us? Do you mean to kill me as you killed the Egyptian?”
Then Moses was afraid, and thought, “Surely the thing is known.” When Pharaoh heard of it, he sought to kill Moses. But Moses fled from Pharaoh and stayed in the land of Midian.
This appears to be nothing more than Moses seeing an act of cruelty and intervening but the New Testament gives more information.