An interesting item is that according to Genesis, the first thing created was light. Jesus Christ.says that the Lamb of God was slain from the creation of the world. The Light (life) and the Lamb (payment for what caused death) were both provided in the very beginning. Why not? Payment for sin, as well as, eternal life came through the one person
Every other day was good. Why not this one? Simple. It was the day that the one and only Son of God took on the sins of the whole world. He was utterly sinful. He became sin for us. And His Father had to leave Him.
Then God said, “Let there be an expanse in the midst of the waters, and let it separate the waters from the waters.” God made the expanse, and separated the waters which were below the expanse from the waters which were above the expanse; and it was so. God called the expanse heaven. And there was evening and there was morning, a second day. (Genesis 1:6-8)
It was only for three days so what’s the big deal? We’re given insight into the enormity in the Old Testament. As far as the length of time goes.
But do not let this one fact escape your notice, beloved, that with the Lord one day is like a thousand years, and a thousand years like one day. (2 Peter 3:8)
And what Jesus endured is beyond our understanding. We can only get a glimpse of it through the prophets like this Isaiah passage:
But He was pierced through for our transgressions, He was crushed for our iniquities; The chastening for our well-being fell upon Him, And by His scourging we are healed. (Isaiah 53:5)
When the creation was complete –everything needed for mankind to be restored after the upcoming fall– “God saw all that He had made, and behold, it was very good.” Four of the previous days were good –one wasn’t a good day at all. But this day –when everything was complete– was very good.
The seventh day never ended; the others did, but not the Sabbath. We are invited to enter it and rest eternally from trying to please God. The only way to please Him is to trust Him!