Day 1
As soon as God created, he revealed that he is separate from his creation ("Let there be Light"). But his holiness (light) and his love (dark) are two aspects of the one God:
Ps 139:12 ... the darkness and the light [are] both alike [to thee].
He expresses himself to his creation through the two aspects, because if we mix Holiness and Love, we understand neither. If a judge lets a criminal go free we cry that there is no justice. But if we are the criminal and don't get to go free, we cry that there is no mercy.
Only Christ on the cross can mix Holiness and Love to reveal the nature of the Father. All the laws against mixing two things are the same metaphor. One thing will represent love and the other holiness. All of these laws have their metaphoric source in Day 1.
Christ is the morning and evening, reconciling Holiness to Love and Love to Holiness. In the light of day their is the shadow of grace, and in the grace of the Night, their is the holiness of the lights in the firmament.
But we do not understand the Light at all. When God's holiness was revealed to those receiving grace, they did not understand.
- Joh 1:5 ¶ And the light shineth in darkness; and the darkness comprehended it not.
Rather than acknowledge God as God they claimed equality with God (Ro 1:18ff). Intimacy with God is impossible if we do not acknowledge that He alone is God.
The rest of scripture, and the history of mankind, is a lesson that God alone is God. Once we understand it, we can then understand the grace we have received "while we were yet sinners". He gives us what we want (to be gods, and declaring good and evil for ourselves) and lets us wallow in the consequences of it. Eventually everyone cries out that it is not supposed to be this way and every knee bows and every tongue confesses... Just as the Law is a schoolmaster to bring us to Christ, the suffering you and I produce by sin is designed to make us so miserable that we cry out to God.
Day 1 the revelation of Holiness and grace. We will see this in more detail when the narrative concerning Adam is unpacked.
אמר said, word, lamb
With modern vowels, one is led to believe that they are different words. But they were the same word when Jesus read them.
God SAID "Let there be light". He created light by his WORD. The WORD is the LAMB.