"Then He completed them," meaning: He created them "as seven heavens" in two days, "and inspired in each heaven its command." Mujahid said: Meaning, His command that He placed therein from what He willed. "And We have adorned the lowest heaven with lamps," meaning: the stars. "And as protection," meaning: We made the stars as a protection for the heaven against the devils, so they do not hear the revelation, and that is after the sending of Muhammad (peace be upon him).