Genesis 2:2

And on the seventh day God ended His work which He had made; and he rested on the seventh day from all His work which he had made. The work of creation did not extend into the seventh day, but was finished at sundown of the sixth day, which marked the beginning of the seventh. God devoted the seventh day to rest after the creative activity of the preceding days. Not that God was tired out, or that He now turned from the world to devote Himself entirely to the enjoyment of the bliss of heaven, but that the work of creation was finished.