Exodus 2:11-15 NIV
One day, after Moses had grown up, he went out to where his own people were and watched them at their hard labor. He saw an Egyptian beating a Hebrew, one of his own people. Looking this way and that and seeing no one, he killed the Egyptian and hid him in the sand. The next day he went out and saw two Hebrews fighting. He asked the one in the wrong, “Why are you hitting your fellow Hebrew?”
The man said, “Who made you ruler and judge over us? Are you thinking of killing me as you killed the Egyptian?” Then Moses was afraid and thought, “What I did must have become known.”
When Pharaoh heard of this, he tried to kill Moses, but Moses fled from Pharaoh and went to live in Midian, where he sat down by a well.
NIV: New International Version