إِلاَّ بِإِذْنِ الله {except by permission of Allah}: What is the permission of Allah? When the decreed time of death comes:

اللَّهُ يَتَوَفَّى الْأَنفُسَ حِينَ مَوْتِهَا

{Allah takes the souls at the time of their death} (Az-Zumar: 42)

Then the angels are charged for taking the souls:

كِتَابًا مُّؤَجَّلاً {at a decree determined}:

فَإِذَا جَاء أَجَلُهُمْ لاَ يَسْتَأْخِرُونَ سَاعَةً وَلاَ يَسْتَقْدِمُونَ

{So when their time has come, they will not remain behind an hour, nor will they precede [it].} (Al-A’raaf: 34)

Let not a person believe that the events of life which occurs to him are the ones that lead to the end of his life, of course we tell him not to throw himself into destruction, but when the soul ascends, this time is pre-determined, so death is an integral part of life, if we look at an old man or an old woman at the age of ninety, sometimes they do not think of death because Allah (swt) makes forgiveness in human’s nature in order to be there a hope and optimism among people, but let us look at the truth a person can never lose sight of, which is that death is a stage and not the end, it is another part of life that we haven’t seen yet, and we can’t talk about because no one comes after his death to tell us what happened with him, but the One Who created death and life is the One who told us, he is more truthful than the one who died if he would return from his grave and tell us what happened to him, so we have to know that there is a period of transition, and this stage of transition is entered by death, and after that there is a permanent life in the hereafter, either gardens of bliss or hell, this is what Allah (swt) has told us about:

وَجَاءتْ سَكْرَةُ الْمَوْتِ بِالْحَقِّ ذَلِكَ مَا كُنتَ مِنْهُ تَحِيدُ (19) وَنُفِخَ فِي الصُّورِ ذَلِكَ يَوْمُ الْوَعِيدِ (20) وَجَاءتْ كُلُّ نَفْسٍ مَّعَهَا سَائِقٌ وَشَهِيدٌ (21) لَقَدْ كُنتَ فِي غَفْلَةٍ مِّنْ هَذَا فَكَشَفْنَا عَنكَ غِطَاءكَ فَبَصَرُكَ الْيَوْمَ حَدِيدٌ

{(19) And the intoxication of death will bring the truth; that is what you were trying to avoid. (20) And the Horn will be blown. That is the Day of [carrying out] the threat. (21) And every soul will come, with it a driver and a witness. (22) [It will be said], “You were certainly in unmindfulness of this, and We have removed from you your cover, so your sight, this Day, is sharp.”} (Qaaf: 19-22)

There is a blur in the eyes, so they don’t see the whole truth, but after death the truth is seen completely.

وَمَن يُرِدْ ثَوَابَ الدُّنْيَا نُؤْتِهِ مِنْهَا وَمَن يُرِدْ ثَوَابَ الآخِرَةِ نُؤْتِهِ مِنْهَا {And whoever desires the reward of this world – We will give him thereof; and whoever desires the reward of the Hereafter – We will give him thereof}: Allah (swt) gives the reward in the world to all people; because things are linked to causes, so whoever takes the means will get the result. If a person wants to be a believer, he works to gain the reward in this world and the hereafter because Allah (swt) says:

وابْتَغِ فِيمَا آتَاكَ اللَّهُ الدَّارَ الْآخِرَةَ وَلَا تَنسَ نَصِيبَكَ مِنَ الدُّنْيَا

{But seek, through that which Allah has given you, the home of the Hereafter; and [yet], do not forget your share of the world.} (Al-Qasas: 77)

وَسَنَجْزِي الشَّاكِرِينَ {And we will reward the grateful.}: Gratitude and praise sustains the continuity of grace, and patience leads to overcoming adversity, and this patience is gratitude