[21].Al-Anbiya [The Prophets]: Ayat 94-95

Ayat 94. So whoever does righteous good deeds while he is a believer (in the Oneness of Allah Islamic Monotheism), his efforts will not be rejected. Verily! We record it in his Book of deeds.

Ayat 95. And a ban is laid on every town (population) which We have destroyed that they shall not return (to this world again, nor repent to Us).

[Tafseer] Whoever works any act of righteousness and has faith,- His endeavour will not be rejected: We shall record it in his favour. Allah gives credit for every act of righteousness, however small: when combined with sincere Faith in Allah, it becomes the stepping stone to higher and higher things. It is never lost. But there is a ban on any population which We have destroyed: that they( shall not return, But when wickedness comes to such a pass that the Wrath of Allah descends, as it did on Sodom , the case becomes hopeless. The righteous were warned and delivered before the Wrath descended. But those destroyed will not get another chance, as they flouted all previous chances. They will only be raised at the approach of the Day of Judgement.  

Hazrat Abdullah bin `Umar (May allah be pleased with them) reported: Messenger of Allah [SAWW](PBUH) took hold of my shoulders and said, "Be in the world like a stranger or a wayfarer". Ibn `Umar (May Allah be pleased with them) used to say: "When you survive till the evening, do not expect to live until the morning; and when you survive until the morning, do not expect to live until the evening; (do good deeds) when you are in good health before you fall sick, and (do good deeds) as long as you are alive before death strikes".

[Al-Bukhari Book 08, Chapter 76, Hadith # 425].

Lesson : as mentioned above in Surah Al-Anbiya Ayat 94."whoever does righteous good deeds while he is a believer" A person who will consider this world as a temporary stage, will certainly not like that his clothes be entangled in thorny bushes of this world. The greatest fault of man is that he does not understand this status of the world. In spite of the fact that he is not sure of a moment's life here, he occupies himself in amassing goods and riches which would last for a hundred years.