16:70
وَٱللَّهُ خَلَقَكُمْ ثُمَّ يَتَوَفَّىٰكُمْ ۚ وَمِنكُم مَّن يُرَدُّ إِلَىٰٓ أَرْذَلِ ٱلْعُمُرِ لِكَىْ لَا يَعْلَمَ بَعْدَ عِلْمٍۢ شَيْـًٔا ۚ إِنَّ ٱللَّهَ عَلِيمٌۭ قَدِيرٌۭ
And Allah created you; then He will take you in death. And among you is he who is reversed to the most decrepit [old] age so that he will not know, after [having had] knowledge, a thing. Indeed, Allah is Knowing and Competent.
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
In Man there is a Lesson
Allah tells us that He is controlling the affairs of His servants. He is the One Who created them out of nothing, then He will cause them to die. But there are some of them that He allows to grow old, which is a physical weakness, as Allah says:
اللَّهُ الَّذِى خَلَقَكُمْ مِّن ضَعْفٍ ثُمَّ جَعَلَ مِن بَعْدِ ضَعْفٍ قُوَّةٍ
(Allah is He Who created you in (a state of) weakness, then gave you strength after weakness, then after strength gave (you) weakness) (30:54)
لِكَىْ لاَ يَعْلَمَ بَعْدَ عِلْمٍ شَيْئًا
(so that they know nothing after having known.) meaning, after he knew things, he will reach a stage where he knows nothing because of weakness of mind due to old age and senility. Thus Al-Bukhari, when commenting on this Ayah, reported a narration from Anas bin Malik that the Messenger of Allah ﷺ used to pray:
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