Rabbi Simeon said: They called him Ṭob (good), as it is said, "And when she saw him that he was good" (Ex. 2:2). They concealed him in a house || of the earth for three months. After three months she put him in an ark of bulrushes, and she cast him upon the bank of the river. All things are revealed before the Holy One, blessed be He.
Now Bithyah, the daughter of Pharaoh, was smitten sorely with leprosy and she was not able to bathe in hot water, and she came to bathe in the river, and she saw the crying child. She put forth her hand and took hold of him, and she was healed. She said: This child is righteous, and I will preserve his life. Whosoever preserves a life is as though he had kept alive the whole world. Therefore was she worthy to (inherit) the life in this world and the life in the world to come.