Exodus 2:11-25

"Many years later, when Moses had grown up, he went out to visit his own people, the Hebrews, and he saw how hard they were forced to work. During his visit, he saw an Egyptian beating one of his fellow Hebrews. After looking in all directions to make sure no one was watching, Moses killed the Egyptian and hid the body in the sand." v11-12
Moses tried to make sure no one was watching before he killed the Egyptian. But as it turned out, someone did see, and Moses had to flee the country. Sometimes we mistakenly think we can get away with doing wrong if no one sees or catches us. Sooner or later, however, doing wrong will catch up with us as it did with Moses. Even if we are not caught in this life, we will still have to face God and his evaluation of actions.

Taken from the NLT Life Application Study Bible