[24].Surah An-Nur [The Light]: Ayat 45

৪৫. আল্লাহ প্রত্যেক চলন্ত জীবকে পানি দ্বারা সৃষ্টি করেছেন। তাদের কতক বুকে ভয় দিয়ে চলে, কতক দুই পায়ে ভর দিয়ে চলে এবং কতক চার পায়ে ভর দিয়ে চলে;আল্লাহ যা ইচ্ছা সৃষ্টি করেন।নিশ্চয়ই আল্লাহ সবকিছু করতে সক্ষম।

Ayat 45. Allah has created every moving (living) creature from water. Of them there are some that creep on their bellies, some that walk on two legs, and some that walk on four. Allah creates what He wills. Verily! Allah is Able to do all things.

[Tafseer] of Ayat 45. And Allah has created every animal from water: of them there are some that creep on their bellies; some that walk on two legs; and some that walk on four. Allah creates what He wills; for verily Allah has power over all things. Protoplasm is the basis of all living matter, and "the vital power of protoplasm seems to depend on the constant presence of water" "Living protoplasm always contains a large amount of water. The creeping things include worms and lowly forms of animal life as well as reptiles (like snakes), centipedes, spiders, and insects. Where these have legs they are small, and the description of creeping or crawling is more applicable to them than that of walking. Fishes and sea-animals generally cannot be said to walk: their swimming is like "creeping on their bellies". Two-legged animals include birds and man. Most of the mammals walk on four legs. This includes the whole of the animal world In Allah's Will and Plan, the variety of forms and habits among animals is adapted to their various modes of life and stages of biological evolution. 

Hazrat Aishah (May Allah be pleased with her) reported: The Messenger of Allah [SAWW](PBUH) used to observe I`tikaf in the last ten days of Ramadan and say, "Seek Lailat-ul-Qadr (Night of Decree) in the odd nights out of the last ten nights of Ramadan.''

[Al-Bukhari Book 03, Chapter 32, Hadith # 234]. 

Lesson : as mentioned above in Surah An-Nur Ayat 45."Verily! Allah is Able to do all things. We learn from this Hadith that Lailat-ul-Qadr occurs in any of the five odd nights - 21st, 23rd, 25th, 27th and 29th - of the last ten nights of Ramadan. Its exact date has not been revealed for the reason that people keep themselves awake for prayer for a larger number of nights. Had its date been fixed, people would have kept awake for prayer only on that night. There is a general belief among the scholars that it is fixed, on the 27th night of Ramadan. But this is not correct. Ahadith do not confirm this view.