الآية رقم (77) - أَلَمْ تَرَ إِلَى الَّذِينَ قِيلَ لَهُمْ كُفُّواْ أَيْدِيَكُمْ وَأَقِيمُواْ الصَّلاَةَ وَآتُواْ الزَّكَاةَ فَلَمَّا كُتِبَ عَلَيْهِمُ الْقِتَالُ إِذَا فَرِيقٌ مِّنْهُمْ يَخْشَوْنَ النَّاسَ كَخَشْيَةِ اللّهِ أَوْ أَشَدَّ خَشْيَةً وَقَالُواْ رَبَّنَا لِمَ كَتَبْتَ عَلَيْنَا الْقِتَالَ لَوْلا أَخَّرْتَنَا إِلَى أَجَلٍ قَرِيبٍ قُلْ مَتَاعُ الدَّنْيَا قَلِيلٌ وَالآخِرَةُ خَيْرٌ لِّمَنِ اتَّقَى وَلاَ تُظْلَمُونَ فَتِيلاً

(77) - (Have you not seen those who were told, "Restrain your hands [from fighting] and establish prayer and give zakah"? But then when fighting was ordained for them, at once a party of them feared men as they fear Allah or with [even] greater fear. They said, "Our Lord, why have You decreed upon us fighting? If only You had postponed [it for] us for a short time." Say, The enjoyment of this world is little, and the Hereafter is better for he who fears Allah. And injustice will not be done to you, [even] as much as a thread [inside a date seed].")

In the beginning of Islam, Muslims were not allowed to fight, later fight was legislated after their migration from homeland unfairly.

( فَلَمَّا كُتِبَ عَلَيْهِمُ الْقِتَالُ إِذَا فَرِيقٌ مِّنْهُمْ يَخْشَوْنَ النَّاسَ كَخَشْيَةِ اللَّهِ أَوْ أَشَدَّ خَشْيَةً ) (…But then when fighting was ordained for them, at once a party of them feared men as they fear Allah or with [even] greater fear.…): When they settled in Medina, the hypocrites feared people as they feared Allah (swt) and even more, they do not take into consideration the power of Allah (swt).

( وَقَالُوا رَبَّنَا لِمَ كَتَبْتَ عَلَيْنَا الْقِتَالَ ) (…They said, “Our Lord, why have You decreed upon us fighting? …): Because they are afraid of death.

 ( قُلْ مَتَاعُ الدُّنْيَا قَلِيلٌ ) (…Say, The enjoyment of this world is little, …): The enjoyment of life is enjoyment of delusion whatever it is; it is little because it is changeable life, not permanent for anyone:

إِنَّكَ مَيِّتٞ وَإِنَّهُم مَّيِّتُونَ

(Indeed, you are to die, and indeed, they are to die.) (Az-:Zumar: 30)

This is a divine law, no one whoever can never ever flee from it since the creation of Adam (PBUH) until the Last Day, so no matter how much the enjoyment of this life is, it is little as long as it will end, you will either leave it or it will leave you.

( وَٱلۡأٓخِرَةُ خَيۡرٞ لِّمَنِ ٱتَّقَىٰ وَلَا تُظۡلَمُونَ فَتِيلاً ) (…and the Hereafter is better for he who fears Allāh. And injustice will not be done to you, [even] as much as a thread): The Hereafter is better because its gifts are everlasting; no death there and nothing will change. The man is not oppressed, for Allah (swt) is justice and He says:

 وَنَضَعُ ٱلۡمَوَٰزِينَ ٱلۡقِسۡطَ لِيَوۡمِ ٱلۡقِيَٰمَةِ فَلَا تُظۡلَمُ نَفۡسٞ شَيۡـٔٗاۖ وَإِن كَانَ مِثۡقَالَ حَبَّةٖ مِّنۡ خَرۡدَلٍ أَتَيۡنَا بِهَاۗ وَكَفَىٰ بِنَا حَٰسِبِينَ

(And We place the scales of justice for the Day of Resurrection, so no soul will be treated unjustly at all. And if there is [even] the weight of a mustard seed, We will bring it forth. And sufficient are We as accountant.) (Al-Anbiyaa: 47)