'Stretched Out His Hand' in the Bible

And Aaron stretched out his hand over the waters of Egypt, and the frogs came up, and covered the land of Egypt.

And they did so. And Aaron stretched out his hand with his rod, and smote the dust of the earth. And there were lice upon man, and upon beast; all the dust of the earth became lice throughout all the land of Egypt.

And Moses stretched out his hand over the sea, and LORD caused the sea to go [back] by a strong east wind all the night, and made the sea dry land, and the waters were divided.