Let There Be Light and the Five Mentions of Light

(Genesis 1:3-5) And God said, Let there be light. Rabbi Yehudah says, The light was created first. A parable: to a king who wished to build a palace, and the place was dark. What did he do? He lit lamps and entered, to know how to set the foundations. Rabbi Nechemyah says, Heaven and earth were created first. A parable: to a king who built a palace and adorned it with lamps. Rabbi Shmuel bar Rav Yitzchak said, (Psalms 119:130) The opening of Your words gives light. From the opening of Your mouth there was light for us, And God said, Let there be light. Rabbi Yehudah bar Simon said, (Psalms 33:6) By the word of the LORD the heavens were made. Not with labor and not with toil did the Holy One, blessed be He, create His world, but by the word of the LORD. Rabbi Yehoshua ben Yehotzadak asked Rabbi Shmuel bar Nachmani. He said to him, Because I have heard about you that you are a master of aggadah, from where was the light created? He said to him, This teaches that the Holy One, blessed be He, wrapped Himself in a white garment and the radiance of His splendor shone from one end of the world to the other. And he said it to him in a whisper. He said to him, It is an explicit verse, He wraps Himself in light as in a garment, and you say it to me in a whisper? He said to him, Just as I heard it in a whisper, so I have told it in a whisper. And were it not an established teaching, it would not be permitted to say it. Before this, what would they say? That it was created from the place of the Temple, as it says, And behold, the glory of the God of Israel came from the way of the east, and so on, and the earth shone from His glory, and glory means only the Temple, as it says (Jeremiah 17:12), A throne of glory on high from the first, the place of our sanctuary. Rabbi Simon said, Five times the word light is written here, corresponding to the five books of the Torah. Let there be light, corresponding to the book of Genesis, in which the Holy One, blessed be He, occupied Himself and created His world. And there was light, corresponding to the book of And these are the names [Exodus], in which Israel went out from gloom to light. And God saw the light, that it was good, corresponding to the book of And He called [Leviticus], which is full of many laws. And God divided between the light, corresponding to the book of And He spoke [Numbers], which divides between those who went out of Egypt and those who entered the land. And God called the light day, corresponding to Deuteronomy, which is full of many laws. They objected to him, But is not the book of Leviticus full of many laws? He said to them, That book too repeats matters in it. And God saw the light. From where do we learn that one does not bless over a lamp until one benefits from its light? From here, And God saw the light, and He divided.