[34].Surah Saba [Sheba]: Ayat 21

২১. তাদের উপর শয়তানের কোন ক্ষমতা ছিল না, তবে কে পরকালে বিশ্বাস করে এবং কে তাতে সন্দেহ করে, তা প্রকাশ করাই ছিল আমার উদ্দেশ্য। আপনার পালনকর্তা সব বিষয়ে তত্ত্বাবধায়ক।

Ayat 21. And he (Iblis ­ Satan) had no authority over them, except that Allah might test him, who believes in the Hereafter from him who is in doubt about it. And your Lord is a Hafiz over everything. (All Knower of everything i.e. He keeps record of each and every person as regards deeds, and then He will reward them accordingly).

Tafseer of Surah Saba' (Sheba) Ayat 21. But he had no authority over them, except that Allah might test the man who believes in the Hereafter from him who is in doubt concerning it: and thy Lord doth watch over all things. Might test: the word in the original is might know. It is not that Allah does not know all. Why does He want to test? It is in order to help us subjectively, to train our will, to put us definitely the question, "Will you obey Allah or other than Allah?" (Cf. 3:154 and also 47:31).

Hazrat Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) said,  "The religion (of Islam) is easy, and whoever makes the religion a rigour, it will overpower him. So, follow a middle course (in worship); if you can't do this, do something near to it and give glad tidings and seek help (of Allah) at morn and at dusk and some part of night". [Al-Bukhari Book 01, Chapter 02, Hadith # 038]

Lesson: as mentioned above in Surah Saba Ayat 21.” your Lord is a Hafiz over everything. (All Knower of everything i.e. He keeps record of each and every person as regards deeds, and then He will reward them accordingly). Besides moderation in worship, this Hadith enjoins that such times should be fixed for worship when one is fresh so that one feels pleasure in performing it. But this principle is for optional and voluntary prayers only. Obligatory Salat are to be performed at the prescribed times only.