**15:1 & *15:9 The divine source and the perfect preservation of the Quran are proven by the Quran's mathematical code (App. 1). God's Messenger of the Covenant was destined to unveil this great miracle. The word "Dhikr" denotes the Quran's code in several verses (15:6, 21:2, 26:5, 38:1, 38:8, 74:31). The value of "Rashad Khalifa" (1230)+15+9=1254, 19x66.

**15:1 & *15:9 The divine source and the perfect preservation of the Quran are proven by the Quran's mathematical code (App. 1). God's Messenger of the Covenant was destined to unveil this great miracle. The word "Dhikr" denotes the Quran's code in several verses (15:6, 21:2, 26:5, 38:1, 38:8, 74:31). The value of "Rashad Khalifa" (1230)+15+9=1254, 19x66.

**15:20 When we send astronauts into space, we provide them with precisely measured quantities of food, water, and oxygen. God created the spaceship Earth with billions of astronauts who work and reproduce; He supplied them with a self-supporting system that generates oxygen, fresh water, and a great variety of delicious foods and drinks.

**15:85-88 One of the functions of God's Messenger of the Covenant is to deliver the Quranic assertion that the world will end in AD 2280 (20:15, 72:27 & Appendix 25).

**15:99 The practices of worship are our means of attaining certainty (Appendix 15).