Where did Moses hide the body of the Egyptian he killed for beating a Hebrew?

Answer: In the sand

Looking this way and that and seeing no one, Moses struck down the Egyptian and hid his body in the sand.

“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.”— Exodus 2:11-12 (BSB)