Tafsir Ibn Kathir -> Surah At-Taghabun -> Life after Death is True

Allah the Exalted informs about the disbelievers, idolators and the atheists that they claim that they will not be resurrected,

﴿قُلْ بَلَى وَرَبِّى لَتُبْعَثُنَّ ثُمَّ لَتُنَبَّؤُنَّ بِمَا عَمِلْتُمْ﴾

(Say: "Yes! By my Lord, you will certainly be resurrected, then you will be informed of what you did...'') meaning, `you will be informed of all of your actions, whether major or minor, big or small,'

﴿وَذَلِكَ عَلَى اللَّهِ يَسِيرٌ﴾

(and that is easy for Allah.) `resurrecting and recompensing you is easy for Allah.' This is the third Ayah in which Allah orders His Messenger to swear by His Lord, the Exalted and Most Honored, that Resurrection occurs. The first is in Surah Yunus,

﴿وَيَسْتَنْبِئُونَكَ أَحَقٌّ هُوَ قُلْ إِى وَرَبِّى إِنَّهُ لَحَقٌّ وَمَآ أَنتُمْ بِمُعْجِزِينَ ﴾

(And they ask you to inform them: "Is it true'' Say: "Yes! By my Lord! It is the very truth! and you can not escape it!'') (10:53), The second is in Surah Saba',

﴿وَقَالَ الَّذِينَ كَفَرُواْ لاَ تَأْتِينَا السَّاعَةُ قُلْ بَلَى وَرَبِّى لَتَأْتِيَنَّكُمْ﴾

(Those who disbelieve say: "The hour will not come to us.'' Say: "Yes, by my Lord, it will come to you...'') (34:3), and the third is this Ayah,

﴿زَعَمَ الَّذِينَ كَفَرُواْ أَن لَّن يُبْعَثُواْ قُلْ بَلَى وَرَبِّى لَتُبْعَثُنَّ ثُمَّ لَتُنَبَّؤُنَّ بِمَا عَمِلْتُمْ وَذَلِكَ عَلَى اللَّهِ يَسِيرٌ ﴾

(The disbelievers pretend that they will never be resurrected. Say: "Yes! By my Lord, you will certainly be resurrected, then you will be informed of what you did; and that is easy for Allah.'') Allah the Exalted said,

﴿فَـَامِنُواْ بِاللَّهِ وَرَسُولِهِ وَالنّورِ الَّذِى أَنزَلْنَا﴾

(Therefore, believe in Allah and in His Messenger and in the Light which We have sent down.) that is, the Qur'an,

﴿وَاللَّهُ بِمَا تَعْمَلُونَ خَبِيرٌ﴾

(And Allah is All-Aware of what you do.) none of your deeds ever escapes His knowledge.