The Terrors of the Day of Resurrection, and how the Wrongdoers will wish that They had taken a Path with the Messenger

Here Allah tells us about the terror of the Day of Resurrection and the tremendous events that will happen, including the splitting of heavens when they are pierced by the clouds, that is the shadow of the magnificent light which dazzles all sight. The angels of heaven will come down on that Day and surround all creatures at the place of gathering, then the Lord, may He be blessed and exalted, will come to pass judgement. Mujahid said, "This is as Allah says:

هَلْ يَنظُرُونَ إِلاَّ أَن يَأْتِيَهُمُ اللَّهُ فِي ظُلَلٍ مِّنَ الْغَمَامِ وَالْمَلَـئِكَةُ

يَا وَيْلَتَىٰ لَيْتَنِي لَمْ أَتَّخِذْ فُلَانًا خَلِيلًا (Woe to me! would that I had not taken so-and-so for my friend - 25:28). This verse was revealed on an especial occasion, but its implication is universal. The background is that 'Uqbah Ibn Abi Mu` ait was one of the chieftains of polytheists in Makkah. It was customary with him that whenever he would return after an expedition, he used to invite the nobility of the city to dinner. He also used to call on the Holy Prophet ﷺ frequently. When he presented the food to the Holy Prophet ﷺ he said "I cannot eat your food until you proclaim that Allah is one and no one can be associated with Him in worship and that I am His Rasul." 'Uqbah recited this sentence and then the Holy Prophet ﷺ ate the dinner according to his promise, 'Ubayy Ibn Khalaf was a close friend of 'Uqbah. When he learnt that 'Uqbah has accepted Islam and has recited the Kalimah Tayyabah he was very crossed with him. 'Uqbah tried to defend himself by explaining that Muhammad ﷺ was an eminent person of Quraysh and if he had returned without having his meal at his house, it would have been very degrading for 'Uqbah. Therefore, in order to please him, he repeated the sentence (کلمہ). 'Ubayy Ibn Khalaf did not accept this explanation and asked 'Uqbah to go and spit on Holy Prophet's ﷺ face if he was really ashamed. The wretched man obliged his depraved friend and did as he had suggested. Allah Ta’ ala disgraced them both in this world as well, as both were killed in the battle of Badr (Baghawi). The torment he will face on the Dooms day is described in this verse that when he will see the torment before him, he will bite his fingers in distress and repentance and say "would that he had not made 'Ubayy Ibn Khalaf his friend in the world". (Mazhari Qurtubi)

Friendship of wicked persons and non believers will be a matter of shame and repentance in the Hereafter