The last two things God created was the Shabbat/Sabbath and the Garden of Eden. God did not create the Shabbat because He was exhausted or tired. Rather, He wanted to set aside a day for mankind to have a special time with Him. Also some are confused about the creation narratives of Gen. 1 and Gen. 2 but a careful reading of each shows us that Gen. 2 focuses specifically on the creation of mankind and the special Garden called Eden that was made by God as mankind’s primary residence.
