The Word of God is perfect. Nothing is ever left out or put in by mistake. The fact that there is no mention of a beginning and an end on the 7th day in Genesis 2:1-3 was purposeful and meant to teach us something. The Word says God had completed the work that He had done, and He rested. We know God does not need rest because He is God, and He is all-powerful. The point is He was finished with that particular job and He was satisfied.
In life, it seems we are never satisfied. We are always trying to do more, get more, and be more. We are constantly on the run. We seldom take a break and look at all God has done for us. God knew we would be like this. He knew we would need help with time management. He commanded us in Exodus 20:8 to “Remember the Sabbath Day and keep it Holy”. He wants us to have just one day out of every seven days to set aside all our distractions and just remember Him and His good works. God also knew that we would try to figure all our problems out ourselves.
Based on the fact there is no beginning and end to God’s rest on the 7th day, He is showing us He wants us to constantly be at rest in Him. To always know that, because of Jesus Christ and God’s amazing grace, we have nothing to worry about and nothing to fear. We need to hand our problems over to God, no longer labor in them, and know that “particular job” is finished. Most importantly, we need to trust our salvation is finished and rest in the fact He is good.