“And God said, Let there be light and there was light!” This is the first step of the biblical creation; first of all, we see how God creates without using external tools, as well indicated by the Hebrew verb barà. In fact, he uses the simple word – davàr – which, according to the Jews, was not just something pronounced, but also something you do while pronouncing.
“Let there be light!” This is the imperative of the verb “to be” – in Hebrew hayàh. We can imagine a point of light that gradually fills, but did not cancel it, the obscure background of darkness. Darkness is not simply absence of light, because it is a presence opposed to the light, that is God (e.g. Job 29:3 ). The imperative is followed by execution: “and there was light!” So, between the word and the creative will of God Almighty there is no barrier, because God says what happens immediately.
In the Bible , the light represents the essence of God (cf. Psalm 117:27 ; 1 John 1,5), although in this verse it appears as one of the creations of God. In rabbinic literature it is said that God created here not only light, but also the bright world he inhabits. New Testament seems to solve the mystery because it says that “God dwells in unapproachable light” (1 Timothy 6:16) .
Moreover, even the darkness doesn’t coincide with the beings that inhabit it. For example, the Leviathan (Isaiah 27:1 ) or the same snake, or even the sea monsters that will be created on the fifth day (Genesis 1:21). So in my opinion the light is God or his essence, but it is also the “place” in which he dwells in.