The Last Hour would affect (most terribly) the wicked persons.  

عَنِ النَّبِيِّ ﷺ قَالَ لاَ تَقُومُ السَّاعَةُ إِلاَّ عَلَى شِرَارِ النَّاسِ  

I and the Last Hour are (close to each other) like this (and he, in order to explain it) pointed (by joining his) forefinger, (one) next to the thumb and the middle finger (together).  

قَالَ رَسُولُ اللَّهِ ﷺ وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ وَاللَّفْظُ لَهُ حَدَّثَنَا يَعْقُوبُ عَنْ أَبِي حَازِمٍ أَنَّهُ سَمِعَ سَهْلاً يَقُولُ سَمِعْتُ النَّبِيَّ ﷺ يُشِيرُ بِإِصْبَعِهِ الَّتِي تَلِي الإِبْهَامَ وَالْوُسْطَى وَهُوَ يَقُولُ بُعِثْتُ أَنَا وَالسَّاعَةُ هَكَذَا  

I and the Last Hour have been sent like this. Shu'ba said: I heard Qatada as saying in his narration: The excellence of one over the other. And I do not know whether he narrated it from Anas or Qatada himself said so.  

قَالَ رَسُولُ اللَّهِ ﷺ بُعِثْتُ أَنَا وَالسَّاعَةُ كَهَاتَيْنِ قَالَ شُعْبَةُ وَسَمِعْتُ قَتَادَةَ يَقُولُ فِي قَصَصِهِ كَفَضْلِ إِحْدَاهُمَا عَلَى الأُخْرَى فَلاَ أَدْرِي أَذَكَرَهُ عَنْ أَنَسٍ أَوْ قَالَهُ قَتَادَةُ  

I heard Qatada and Abu Tayyab narrating that both of them heard Anas as narrating that Messenger of Allah ﷺ said: I and the Last Hour have been sent like this, and Shu'ba drew his forefinger and middle finger near each other while narrating it.  

سَمِعْتُ قَتَادَةَ وَأَبَا التَّيَّاحِ يُحَدِّثَانِ أَنَّهُمَا سَمِعَا أَنَسًا يُحَدِّثُ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ بُعِثْتُ أَنَا وَالسَّاعَةُ هَكَذَا وَقَرَنَ شُعْبَةُ بَيْنَ إِصْبَعَيْهِ الْمُسَبِّحَةِ وَالْوُسْطَى يَحْكِيهِ  

This hadith has been narrated on the authority of Anas through another chain of transmitters.  

عَنِ النَّبِيِّ ﷺ بِهَذَا  

Anas reported Allah's Apostle ﷺ as saying like this, but he narrated it through another chain of transmitters.  

عَنِ النَّبِيِّ ﷺ بِمِثْلِ حَدِيثِهِمْ  

I and the Last Hour have been sent like this and (he while doing it) joined the forefinger with the middle finger.  

قَالَ رَسُولُ اللَّهِ ﷺ بُعِثْتُ أَنَا وَالسَّاعَةُ كَهَاتَيْنِ قَالَ وَضَمَّ السَّبَّابَةَ وَالْوُسْطَى  

If he lives he would not grow very old that he would find your Last Hour coming to you (he would see you dying).  

كَانَ الأَعْرَابُ إِذَا قَدِمُوا عَلَى رَسُولِ اللَّهِ ﷺ سَأَلُوهُ عَنِ السَّاعَةِ مَتَى السَّاعَةُ فَنَظَرَ إِلَى أَحْدَثِ إِنْسَانٍ مِنْهُمْ فَقَالَ إِنْ يَعِشْ هَذَا لَمْ يُدْرِكْهُ الْهَرَمُ قَامَتْ عَلَيْكُمْ سَاعَتُكُمْ  

If this young boy lives, he may not grow very old till (he would see) the Last Hour coming to you.  

أَنَّ رَجُلاً سَأَلَ رَسُولَ اللَّهِ ﷺ مَتَى تَقُومُ السَّاعَةُ وَعِنْدَهُ غُلاَمٌ مِنَ الأَنْصَارِ يُقَالُ لَهُ مُحَمَّدٌ فَقَالَ رَسُولُ اللَّهِ ﷺ إِنْ يَعِشْ هَذَا الْغُلاَمُ فَعَسَى أَنْ لاَ يُدْرِكَهُ الْهَرَمُ حَتَّى تَقُومَ السَّاعَةُ  

When would the Last Hour come? Thereupon Messenger of Allah (way peace be upon him) kept quiet for a while. Then looked at a young boy in his presence belonging to the tribe of Azd Shanu'a and he said: If this boy lives he would not grow very old till the Last Hour would come to you. Anas said that this young boy was of our age during those days.  

أَنَّ رَجُلاً سَأَلَ النَّبِيَّ ﷺ قَالَ مَتَى تَقُومُ السَّاعَةُ قَالَ فَسَكَتَ رَسُولُ اللَّهِ ﷺ هُنَيْهَةً ثُمَّ نَظَرَ إِلَى غُلاَمٍ بَيْنَ يَدَيْهِ مِنْ أَزْدِ شَنُوءَةَ فَقَالَ إِنْ عُمِّرَ هَذَا لَمْ يُدْرِكْهُ الْهَرَمُ حَتَّى تَقُومَ السَّاعَةُ قَالَ قَالَ أَنَسٌ ذَاكَ الْغُلاَمُ مِنْ أَتْرَابِي يَوْمَئِذٍ  

A young boy of Mughira b. Shu'ba happened to pass by (the Holy Prophet) and he was of my age. Thereupon Allah's Apostle ﷺ said: If he lives long he would not grow very old till the Last Hour would come (to the old people of this generation).  

النَّبِيُّ ﷺ إِنْ يُؤَخَّرْ هَذَا فَلَنْ يُدْرِكَهُ الْهَرَمُ حَتَّى تَقُومَ السَّاعَةُ  

The Last Hour would come (so sudden) that a person would be milking the she- camel and the (milk) would not reach the brim of the vessel that the Last Hour would come, and the two persons would be engaged in buying and selling of the clothes and their bargain would not be struck before the Last Hour would come. And someone would be setting his tank in order and he would have hardly set it right when the Last Hour would come.  

النَّبِيَّ ﷺ قَالَ تَقُومُ السَّاعَةُ وَالرَّجُلُ يَحْلُبُ اللِّقْحَةَ فَمَا يَصِلُ الإِنَاءُ إِلَى فِيهِ حَتَّى تَقُومَ وَالرَّجُلاَنِ يَتَبَايَعَانِ الثَّوْبَ فَمَا يَتَبَايَعَانِهِ حَتَّى تَقُومَ وَالرَّجُلُ يَلِطُ فِي حَوْضِهِ فَمَا يَصْدُرُ حَتَّى تَقُومَ