Al-Waqi`ah (the occurrence), is one of the names of the Day of Resurrection, because that Day is real and will surely come. Allah the Exalted said in other Ayat,

﴿فَيَوْمَئِذٍ وَقَعَتِ الْوَاقِعَةُ ﴾

(Then on that Day shall the Waqi`ah occur.)( 69:15) Allah the Exalted said,

﴿لَيْسَ لِوَقْعَتِهَا كَاذِبَةٌ ﴾

(There is not, for its occurrence, Kadhibah.) means, when He commands the Day of Resurrection to begin, none can stop it from happening or prevent it from beginning,

﴿اسْتَجِيبُواْ لِرَبِّكُمْ مِّن قَبْلِ أَن يَأْتِىَ يَوْمٌ لاَّ مَرَدَّ لَهُ مِنَ اللَّهِ﴾

(Answer the call of your Lord before there comes from Allah a Day which can not be averted.) (42:47),

﴿سَأَلَ سَآئِلٌ بِعَذَابٍ وَاقِعٍ - لِّلْكَـفِرِينَ لَيْسَ لَهُ دَافِعٌ ﴾

(A questioner asked concerning a torment about to occur -- upon the disbelievers, which none can avert.)(70:1-2),

﴿وَيَوْمَ يَقُولُ كُن فَيَكُونُ قَوْلُهُ الْحَقُّ وَلَهُ الْمُلْكُ يَوْمَ يُنفَخُ فِى الصُّوَرِ عَـلِمُ الْغَيْبِ وَالشَّهَـدَةِ وَهُوَ الْحَكِيمُ الْخَبِيرُ﴾

(And on the Day He will say: "Be!'' -- and it is! His Word is the Truth. His will be the dominion on the Day when the Trumpet will be blown. All-Knower of the unseen and the seen. He is the All-Wise, Well Aware.)(6:73) As for the meaning of

﴿كَاذِبَةٌ﴾

(Kadhibah) Muhammad bin Ka`b said: "It will certainly occur,'' while Qatadah said, "It shall not be discontinued, taken back or aborted. Allah's statement,

﴿خَافِضَةٌ رَّافِعَةٌ ﴾

(Bringing low, exalting.) indicates that Al-Waqi`ah lowers some people to the lowest parts of the Fire, even if they had been mighty in this life. It also elevates others to the highest grades in the residence of eternal delight, even if they were weak in this life. This was said by Al-Hasan, Qatadah and others. Al-`Awfi reported from Ibn `Abbas:

﴿خَافِضَةٌ رَّافِعَةٌ ﴾

(Bringing low, exalting), "It made the near and the far hear it,'' while `Ikrimah said, "It lowered, and thus those who were close heard it, and elevated, and thus those in the distance heard it.'' Ad-Dahhak and Qatadah said similarly. Allah said,

﴿إِذَا رُجَّتِ الاٌّرْضُ رَجّاً ﴾

(When the earth will be shaken with a terrible shake.) meaning, it is shaken and moved violently over all of its surface and through its depths. Ibn `Abbas, Mujahid, Qatadah and others said about Allah's saying:,

﴿إِذَا رُجَّتِ الاٌّرْضُ رَجّاً ﴾

(When the earth will be shaken with a terrible shake.) it means "Violently shaken.'' Ar-Rabi` bin Anas said, "The earth will be shaken with all that is in it, just as a sifter is shaken with its contents.'' This is like Allah's saying:

﴿إِذَا زُلْزِلَتِ الاٌّرْضُ زِلْزَالَهَا ﴾

(When the earth is shaken with its earthquake.)(99:1) and,

﴿يأَيُّهَا النَّاسُ اتَّقُواْ رَبَّكُمْ إِنَّ زَلْزَلَةَ السَّاعَةِ شَىْءٌ عَظِيمٌ ﴾

(O mankind! Have Taqwa of your Lord! Verily, the earthquake of the Hour is a terrible thing.)(22:1). Allah said:

﴿وَبُسَّتِ الْجِبَالُ بَسّاً ﴾

(And the mountains will be powdered to dust,) meaning, relentlessly pulverized. This was said by Ibn `Abbas, Mujahid, `Ikrimah and Qatadah and others. Ibn Zayd said: "The mountains will become just like Allah described them,

﴿كَثِيباً مَّهِيلاً﴾

(A heap of sand poured out.)(73:14).'' Allah's saying:

﴿فَكَانَتْ هَبَآءً مُّنبَثّاً ﴾

(So that they will become floating dust particles.) Abu Ishaq narrated from Al-Harith, from `Ali: "It will become like the rising dust storm that soon fades away leaving no trace of itself behind.'' Al-`Awfi reported from Ibn `Abbas about Allah's saying:

﴿فَكَانَتْ هَبَآءً مُّنبَثّاً ﴾

(So that they will become floating dust particles.) "It describes the rising embers from the fire when it is kindled, but when the embers land, they are extinguished quickly.'' `Ikrimah said, "The floating dust particles that the wind scatters all around,'' while Qatadah said,

﴿هَبَآءً مُّنبَثّاً﴾

(floating particles), "Like the dry parts of trees that the wind scatters all about.'' This Ayah is similar to several other Ayat that indicate that the mountains will be moved from their places, demolished and blown off their bases, becoming like carded wool on the Day of Resurrection.