The Christians say that God rested on the seventh day, that is why many of us observe Sunday as a rest day. According to the third of the Ten Commandments:
Remember the Sabbath day by keeping it holy. Six days you shall labour and do all your work, but the seventh day is a Sabbath to the Lord your God. On it you shall not do any work, neither you, nor your son or daughter, nor your manservant or maidservant, nor your animals, nor the alien within your gates. For in six days the Lord made the heavens and the earth, the sea, and all that is in them, but he rested on the seventh day. Therefore the Lord blessed the Sabbath day and made it holy.
Yet such a doctrine so important for Christians, is directly contradicted by Islamic doctrine. Muslims do not believe that God rested. Indeed, why would an almighty being need rest? Are gods like us, made of flesh and blood, who puff and need resting with physical activities?