(He it is) i.e. it is your Lord (who hath appointed) created (for you the night that you should rest therein and the day giving sight) and the day bright and clear so that you are able to come and go. (Lo! Herein) in that which I have mentioned (verily are portents) lessons (for a folk that heed) the admonitions of the Qur'an and who also obey.