[24].Surah An-Nur [The Light]:Ayat 21

২১. ওহে যারা ঈমান এনেছ! তোমরা শয়তানের পদাঙ্ক অনুসরন করো না। আর যে শয়তানের পদাঙ্ক অনুসরন করে, সে তো তবে অশ্লীলতা ও মন্দ কাজের নির্দেশ দেয়। আর যদি আল্লাহর অনুগ্রহ ও তাঁর করুনা তোমাদের উপর না থাকত তবে তোমাদের মধ্যের কেউই পবিত্র হতে পারত না। কিন্তু আল্লাহ যাকে ইচ্ছা করেন তাকে পবিত্র করেন। আর আল্লাহ সর্বশ্রোতা।

Ayat 21. O you who believe! Follow not the footsteps of Shaitan (Satan). And whosoever follows the footsteps of Shaitan (Satan), then, verily he commands Al-Fahshâ' [i.e. to commit indecency (illegal sexual intercourse, etc.)], and Al-Munkar [disbelief and polytheism (i.e. to do evil and wicked deeds; to speak or to do what is forbidden in Islam, etc.)]. And had it not been for the Grace of Allah and His Mercy on you, not one of you would ever have been pure from sins. But Allah purifies (guides to Islam) whom He wills, and Allah is All-Hearer, All-Knower. 

[Tafseer] of ayat 21. O ye who believe! follow not Satan's footsteps: if any will follow the footsteps of Satan, he will (but) command what is shameful and wrong: and were it not for the grace and mercy of Allah on you, not one of you would ever have been pure: but Allah doth purify whom He pleases: and Allah is One Who hears and knows (all things) Spotless purity in thought, word, and deed, includes the disposition to put the best construction on the motives of others, so that we ascribe no evil motive to the seeming indiscretions of virtuous people. Such a high standard can only come by the grace of Allah, Who hears all prayers and knows all the temptations to which human nature is subject. His Will and Plan make both for spiritual protection and spiritual peace, and we must place ourselves trustingly in His hands. 

Hazrat Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) said, "He who observes optional prayer (Tarawih prayers) throughout Ramadan, out of sincerity of Faith and in the hope of earning reward will have his past sins pardoned.''

[Al-Bukhari Book 03, Chapter 32, Hadith # 226]. 

Lesson : as mentioned above in Surah An-Nur Ayat 21."And had it not been for the Grace of Allah and His Mercy on you, not one of you would ever have been pure from sins. But Allah purifies (guides to Islam) whom He wills," May Allah forgive all our sins by his grace in coming month of Ramadan. Please find attach broacher showing TARAWEEH program all over Karachi with Tafseer-e-Quran.