Thus the heavens and the earth were finished, and all the host of them.
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Bede
AD 735
Under the law the people were ordered to work for six days and to rest on the seventh … because the Lord completed the creation of the world in six days and desisted from his work on the seventh. Mystically speaking, we are counseled by all this that those who in life devote themselves to good works for the Lord’s sake are in the future led by the Lord to sabbath, that is, to eternal rest.
From what toil did God rest? For the creatures that came to be on the first day came to be by implication, except for the light, which came through his word. And the rest of the works that came to be afterward came to be through his word. What toil is there for us when we speak one word? So what toil could there have been for God to speak one word a day? Moses, who divided the sea by his word and his rod, did not tire. Joshua, son of Nun, who restrained the luminaries by his word, did not tire. So what toil could there have been for God when he created the sea and the luminaries by his word? It was not because he rested on that day that God, who does not weary, blessed and sanctified the seventh day. Nor was it because he was to give it to that people, who did not understand that since they were freed from their servitude, they were to give rest to their servants and maidservants. He gave it to them so that, even if they had to be put under requirement, they would rest. It was given to...
You see, in saying at this point that God rested from his works, Scripture teaches us that he ceased creating and bringing from nonbeing into being on the seventh day, whereas Christ, in saying that “my father is at work up until now and I am at work,” reveals his unceasing care for us: he calls “work” the maintenance of created things, bestowal of permanence on them and governance of them through all time. If this wasn’t so, after all, how would everything have subsisted, without the guiding hand above directing all visible things and the human race as well? Homilies on Genesis