Say (O
Muhammad (صلى الله عليه وسلم:
“Shall We tell you the greatest losers in respect of (their) deeds?
الَّذِينَ ضَلَّ سَعْيُهُمْ فِي الْحَيَاةِ الدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا (104)
“Those whose
efforts have been wasted in this life while they thought that they were
acquiring good by their deeds.”
For the
acceptance of the righteous deeds it is stipulated that the following two basic
conditions must be fulfilled:
a) The
intentions while doing such deeds must be totally for Allâh’s sake only without any show-off or to gain praise
or fame.
b) Such a deed must be performed in accordance with the
Sunnah of Allâh’s Messenger Muhammad bin ‘Abdullâh صلى
الله عليه وسلم, the last of the Prophets and the Messengers.
Narrated ‘Aishah رضي الله عنها: Allâh’s Messenger صلى الله عليه وسلم said: “If somebody innovates
something which is not present in our religion (of Islâmic Monotheism), then
that thing will be rejected.”(Sahîh Al-Bukhârî, Vol. 3, Hadîth No.
861).
In another Hadîth narrated ‘Aishah رضي الله عنها: The Prophet صلى الله عليه وسلم said: “Whoever perform a (good) deed
which we have not ordered (anyone) to do (or is not in accord with our religion
of Islâmic Monotheism), then that deed
will be rejected and will not accepted.” (Sahîh Al-Bukhârî, Vol.9, Chapter No. 20 before Hadîth No.449).
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For
Arabic please refer to https://quran.ksu.edu.sa/tafseer/katheer/sura18-aya103.html
For English translation of the Surah Al-Kahf 18 Ayah (103-104) please refer to Translation of The Noble Qur’ān in the English Language by Dr. Muhammad Taqî-ud-Dîn al-Hilâlî and Dr. Muhammad Muhsin Khân, Part 16 page.400. Published by King Fahd Complex For The Printing Of The Holy Qur'ân, Madinah K.S.A.