Exodus 2:3-5

But when she could no longer hide him, she took an ark of bulrushes for him, daubed it with asphalt and pitch, put the child in it, and laid it in the reeds by the river’s bank. And his sister stood afar off, to know what would be done to him. Then the daughter of Pharaoh came down to bathe at the river. And her maidens walked along the riverside; and when she saw the ark among the reeds, she sent her maid to get it.