Surah Al-Takwîr 81:16

فَلَا أُقْسِمُ بِالْخُنَّسِ الْجَوَارِ الْكُنَّسِ

81:16 Here we are told how the planets of the earth ascribe to their unique course. Sometimes they progress ahead and are called Jawârالْجَوَارِ and sometime they begin to recede and go back from whence they had come; then they are named as Khunnasخُنَّسِ (Lisân). This and the following verse may refer to celestial objects on elliptical orbits, thereby receding to their earlier position in respect to the body they are orbiting around and to other celestial objects which recede by following a hyperbolic trajectory. This is in contrast to other bodies that pass by in a straight course without receding. The movement of these planets and the various influences they exert on earth due to these movements are somehow necessary for life on earth. This phenomenon is cited as a proof that the system of our universe is entirely in the hands of One All-Powerful Organiser. He decrees things to come into force in any way He will. How can it be impossible for such an All-Mighty Being to bring about wonderful changes on the Day of Resurrection or on the approach of Resurrection? Again, this phenomenon of nature is cited as a proof of the sending down of Revelation to serve a useful purpose for the spiritual evolution of humanity. Just as the making of the planets and their forwards and backwards journeying is an important means of physical sustenance of humankind, similarly Revelation and Divine Messages are an important means of the spiritual and moral uplifting of humankind.