Az-Zumar الزمر The Troops

Az-Zumar (Arabic: الزمر, ’az-zumar; meaning: "The Troops, The Throngs") is the 39th chapter of the Qur'an, the central religious text of Islam. It contains 75 verses

This surah derives its name from the Arabic word zumar (troops) that occurs in verses 71 and 73. Regarding the timing and contextual background of the believed to have been revealed in the mid-Maccan period when persecutions of the Muslim believers by the polytheists had escalated.[1]

• 1-2 The Quran a revelation from God to Muhammad
• 2-3 Muhammad to exhibit a pure religion to God
• 4-5 God will not show favour to idolaters
• 6 God Hath not chosen to have a son
• 7-8 God manifest in His works of creation and providence
• 9-10 God is Sovereign in His dealings with men
• 11 The ingratitude of idolaters
• 12 The righteous and wicked not equal before God
• 13 The righteous shall be rewarded
• 14-16 Muhammad, the first Muslim, must exhibit the pure religion of God
• 17-18 The loss of the idolaters
• 19 Idolaters who repent shall be rewarded
• 20 Muhammad cannot deliver the reprobate
• 21 The reward of the faithful
• 22 God revealed in the growth and decay of Nature
• 23 The Muslim and the infidel not equal
• 24 The Quran first frightens, then comforts, the Muslims
• 25 The punishment of the wicked in hell
• 26-27 Former infidels punished for maligning their prophets
• 28-30 Every kind of parable in the Quran
• 33-36 The reward and punishment of believers and unbelievers
• 37 The infidels of Makkah threaten Muhammad
• 37-38 True believers shall be rightly directed
• 39 Idolaters acknowledge God as creator
• 40-42 Muhammad yet to be vindicated
• 43 God shall raise the dead as he raiseth from sleep
• 44-45 None can intercede except by God’s permission
• 46 Idolaters dread God but joy in their false gods
• 47 God shall judge between the faithful and the idolaters
• 48 Idolaters will give two worlds to escape God’s wrath
• 49-50 They shall not escape the evils of the judgment-day
• ... ... ... 

9:5 He wraps the night over the day

Translation:  He created the heavens and earth in truth. He wraps the night over the  day and wraps the day over the night and has subjected the sun and the  moon, each running [its course] for a specified term. Unquestionably, He  is the Exalted in Might, the Perpetual Forgiver.[2][6]