Why would the eternal presence of God be chaos and darkness? That would only be the original condition of the creation.
At the end of the days of creation God blessed the seventh day and said it was holy. Every seventh day is in memory of that. Legalism is not necessarily involved. Just remember to do good, not going to work or more importantly make others work with your demand, and draw to God further communicating for others to do so. The law from God is not done, Jesus is the one who is the effective priesthood, sacrifice, and way for us to be clean as needed before God.
the entire creation account is in a chiastic structure that can be predicted. each vs has a parallel and this is very common in early Hebraic writing. For example days 1-3 are more separating events and days 4-6 are filling up with parallels with 1 & 4, 2 & 5, and 3 & 6. 1:1 is paralleled with 2:1. these are parallel each other in a chiastic structure. This leaves the chaos and darkness of 1:2 to be parcelled with the completion of day 7 in 2:2-3. This is no mistake and it matches perfectly in a chiastic structure which then reveals to us a meaning that day 7 is about the antithesis of 1:2. One is of chaos and the other of completion. Not only does it show us the meaning of day 7 it also shows us God is the answer to the darkness and chaos of 1:2. There are a lot of layers happening in the account and it also contrasts the existence of the leviathan as an ancient creation myth in the language "the deep" as there are myths that have creation from a great battle between a god and a leviathan type beast the result of which triggers creation. in the creation account, however, God silences this "deep" in an instant by speaking light silencing the myth with it. Westerners want to approach in a literal vacuum which is just not correct. the account has woven into speaking against pagan myths which is the backdrop we find the Hebrews in at the exodus event, a people driven by pagan practices. The goal of the account is not to tell us how it exactly happening, which would be pointless, but to silence paganism and proclaim a monotheistic God as the source behind all things.
Beyond the metaphors, God cares for all, including animals. We should not require others to work then. You could be violating others rights. God meant rest for us all.
spiritual rest is the deeper meaning of the account whereas physical rest is the surface meaning and not as important. We should never let physical rest get in the way of spiritual rest, spiritual rest should always be our goal, to receive it and to show it and it may happen by breaking physical rest (see Mat 12). if we feel strongly about not violating other people's rights for physical rest then we should turn off all nonessential services on the Sabbath that contribute to a workforce demand. this would include electricity, the internet, telephone/cell phone use, television, driving, going to a restaurant, using non-essential water (like taking a shower) and the list may go on. Anything that is non-essential that has a workforce behind it means we should discontinue its practice if we want to keep the 4th commandment. if we do anything that is non-essential that contributes to a workforce demand we are violating the 4th commandment by its letter. if we want to follow the logic of the physical it points to our heartbeat and breath as work. can you think of anyone who stopped breathing and stopped their heartbeat over the sabbath? there is only one I know of.
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