TibyanTafsir Ibn Kathir
Al-Qamar

The Hour draws near; the cleaving of the Moon

Allah informs about the approach of the Last Hour and the imminent end and demise of the world,

﴿ أَتَىٰٓ أَمۡرُ ٱللَّهِ فَلَا تَسۡتَعۡجِلُوهُ‌ۚ ﴾

(The Event ordained by Allah will come to pass, so seek not to hasten it.)(16:1),

﴿ ٱقۡتَرَبَ لِلنَّاسِ حِسَابُهُمۡ وَهُمۡ فِى غَفۡلَةٍ۬ مُّعۡرِضُونَ ﴾

(Draws near for mankind their reckoning, while they turn away in heedlessness.)(21:1)