The Angel will bear Witness; Allah commands that the Disbeliever be thrown into the Fire
Allah the Exalted states that the scribe angel, who is entrusted with recording the deeds of mankind, will testify against him or her about the deeds he or she did on the Day of Resurrection. He will say,
هَـذَا مَا لَدَىَّ عَتِيدٌ
("Here is (his record) ready with me!"), here it is prepared and completed without addition or deletion. This is when Allah the Exalted will judge the creation with fairness, saying,
أَلْقِيَا فِى جَهَنَّمَ كُلَّ كَفَّارٍ عَنِيدٍ
(Both of you throw into Hell every stubborn disbeliever.) It appears that Allah will say these words to the Sa'iq and Shahid angels; the Sa'iq drove him to the grounds where Reckoning is held and the Shahid testified. Allah the Exalted will order them to throw him in the fire of Jahannam, and worse it is as a destination,
مَا يُبَدَّلُ الْقَوْلُ لَدَيَّ وَمَا أَنَا بِظَلَّامٍ لِّلْعَبِيدِ (The Word is not changed with Me, and I Am not a wrongdoer to My slaves." [ 50:29]
That is, 'I have made my decision which will certainly be implemented: it will never be changed. I will not punish anyone, except on account of their sins after the proof has been established against them. This is an absolutely fair and just decision.'
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 29–34
A picture of death and Doomsday thereafter has been drawn in these verses. It shows what will happen to those who, finding themselves free in this world, became arrogant. This pictorial description is so terrible as to cause extreme unease in the minds of all living beings.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.