And He, the Majestic and Lofty, said:
(وَيَوْمَ يَعَضُّ ٱلظَّالِمُ عَلَىٰ يَدَيْهِ يَقُولُ يَٰلَيْتَنِى ٱتَّخَذْتُ مَعَ ٱلرَّسُولِ سَبِيلًا يَٰوَيْلَتَىٰ لَيْتَنِى لَمْ أَتَّخِذْ فُلَانًا خَلِيلًا لَّقَدْ أَضَلَّنِى عَنِ ٱلذِّكْرِ بَعْدَ إِذْ جَآءَنِىۗ وَكَانَ ٱلشَّيْطَٰنُ لِلْإِنسَٰنِ خَذُولًا)
"And (remember) the Day when the Zalim (wrong-doer, oppressor, polytheist, etc.) will bite at his hands, he will say: "Oh! Would that I had taken a path with the Messenger (Muhammad ﷺ). Ah! Woe to me! Would that I had never taken so-and-so as a friend! "He indeed led me astray from the Reminder (this Quran) after it had come to me. And Shaytaan is ever a deserter to man in the hour of need."
[Al-Furqaan:27-29]
And He said:
(فَأَقْبَلَ بَعْضُهُمْ عَلَىٰ بَعْضٍ يَتَسَآءَلُونَ قَالَ قَآئِلٌ مِّنْهُمْ إِنِّى كَانَ لِى قَرِينٌ يَقُولُ أَءِنَّكَ لَمِنَ ٱلْمُصَدِّقِينَ أَءِذَا مِتْنَا وَكُنَّا تُرَابًا وَعِظَٰمًا أَءِنَّا لَمَدِينُونَ قَالَ هَلْ أَنتُم مُّطَّلِعُونَ فَٱطَّلَعَ فَرَءَاهُ فِى سَوَآءِ ٱلْجَحِيمِ قَالَ تَٱللَّهِ إِن كِدتَّ لَتُرْدِينِ وَلَوْلَا نِعْمَةُ رَبِّى لَكُنتُ مِنَ ٱلْمُحْضَرِينَ أَفَمَا نَحْنُ بِمَيِّتِينَ إِلَّا مَوْتَتَنَا ٱلْأُولَىٰ وَمَا نَحْنُ بِمُعَذَّبِينَ إِنَّ هَٰذَا لَهُوَ ٱلْفَوْزُ ٱلْعَظِيمُ لِمِثْلِ هَٰذَا فَلْيَعْمَلِ ٱلْعَٰمِلُونَ)
"Then they will turn to one another, mutually questioning. A speaker of them will say: "Verily, I had a companion (in the world), who used to say: "Are you among those who believe (in resurrection after death). (That) when we die and become dust and bones, shall we indeed (be raised up) to receive reward or punishment (according to our deeds)?, (The man) said: "Will you look down?" So he looked down and saw him in the midst of the Fire. He said: "By Allah! You have nearly ruined me. "Had it not been for the Grace of my Lord, I would certainly have been among those brought forth (to Hell)." (Allah informs about that true believer that he said): "Are we then not to die (any more)? "Except our first death, and we shall not be punished? (after we have entered Paradise)." Truly, this is the supreme success! For the like of this let the workers work."
[As-Saaffaat:50-61]
And He, the Majestic and Lofty, said:
(وَٱصْبِرْ نَفْسَكَ مَعَ ٱلَّذِينَ يَدْعُونَ رَبَّهُم بِٱلْغَدَوٰةِ وَٱلْعَشِىِّ يُرِيدُونَ وَجْهَهُۥۖ وَلَا تَعْدُ عَيْنَاكَ عَنْهُمْ تُرِيدُ زِينَةَ ٱلْحَيَوٰةِ ٱلدُّنْيَاۖ وَلَا تُطِعْ مَنْ أَغْفَلْنَا قَلْبَهُۥ عَن ذِكْرِنَا وَٱتَّبَعَ هَوَىٰهُ وَكَانَ أَمْرُهُۥ فُرُطًا)
"And keep yourself (O Muhammad ﷺ) patiently with those who call on their Lord (i.e. your companions who remember their Lord with glorification, praising in prayers, etc., and other righteous deeds, etc.) morning and afternoon, seeking His Face, and let not your eyes overlook them, desiring the pomp and glitter of the life of the world; and obey not him whose heart We have made heedless of Our Remembrance, one who follows his own lusts and whose affair (deeds) has been lost."
[Al-Kahf:28]
And the evidences from the Quran are many.
And from the Sunnah is the Hadith of Abu Musa Al-Ash'ari, may Allah be pleased with him, that the Prophet ﷺ said:
(مَثَلُ الْجَلِيسِ الصَّالِحِ وَالْجَلِيسِ السَّوْءِ، كَحَامِلِ الْمِسْكِ وَنَافِخِ الْكِيرِ ؛ فَحَامِلُ الْمِسْكِ إِمَّا أَنْ يُحْذِيَكَ، وَإِمَّا أَنْ تَبْتَاعَ مِنْهُ، وَإِمَّا أَنْ تَجِدَ مِنْهُ رِيحًا طَيِّبَةً، وَنَافِخُ الْكِيرِ إِمَّا أَنْ يُحْرِقَ ثِيَابَكَ، وَإِمَّا أَنْ تَجِدَ رِيحًا خَبِيثَةً)
"The likeliness of a good companion and a bad companion is that of someone selling Musk and a blacksmith, the one selling Musk he either gives it to you, or he sells it to you, or you either find a pleasang smell from him. And the blacksmith he either burns your clothes or you find a putrid smell from him."
Agreed upon.
(وَيَوْمَ يَعَضُّ ٱلظَّالِمُ عَلَىٰ يَدَيْهِ يَقُولُ يَٰلَيْتَنِى ٱتَّخَذْتُ مَعَ ٱلرَّسُولِ سَبِيلًا يَٰوَيْلَتَىٰ لَيْتَنِى لَمْ أَتَّخِذْ فُلَانًا خَلِيلًا لَّقَدْ أَضَلَّنِى عَنِ ٱلذِّكْرِ بَعْدَ إِذْ جَآءَنِىۗ وَكَانَ ٱلشَّيْطَٰنُ لِلْإِنسَٰنِ خَذُولًا)
"And (remember) the Day when the Zalim (wrong-doer, oppressor, polytheist, etc.) will bite at his hands, he will say: "Oh! Would that I had taken a path with the Messenger (Muhammad ﷺ). Ah! Woe to me! Would that I had never taken so-and-so as a friend! "He indeed led me astray from the Reminder (this Quran) after it had come to me. And Shaytaan is ever a deserter to man in the hour of need."
[Al-Furqaan:27-29]
And He said:
(فَأَقْبَلَ بَعْضُهُمْ عَلَىٰ بَعْضٍ يَتَسَآءَلُونَ قَالَ قَآئِلٌ مِّنْهُمْ إِنِّى كَانَ لِى قَرِينٌ يَقُولُ أَءِنَّكَ لَمِنَ ٱلْمُصَدِّقِينَ أَءِذَا مِتْنَا وَكُنَّا تُرَابًا وَعِظَٰمًا أَءِنَّا لَمَدِينُونَ قَالَ هَلْ أَنتُم مُّطَّلِعُونَ فَٱطَّلَعَ فَرَءَاهُ فِى سَوَآءِ ٱلْجَحِيمِ قَالَ تَٱللَّهِ إِن كِدتَّ لَتُرْدِينِ وَلَوْلَا نِعْمَةُ رَبِّى لَكُنتُ مِنَ ٱلْمُحْضَرِينَ أَفَمَا نَحْنُ بِمَيِّتِينَ إِلَّا مَوْتَتَنَا ٱلْأُولَىٰ وَمَا نَحْنُ بِمُعَذَّبِينَ إِنَّ هَٰذَا لَهُوَ ٱلْفَوْزُ ٱلْعَظِيمُ لِمِثْلِ هَٰذَا فَلْيَعْمَلِ ٱلْعَٰمِلُونَ)
"Then they will turn to one another, mutually questioning. A speaker of them will say: "Verily, I had a companion (in the world), who used to say: "Are you among those who believe (in resurrection after death). (That) when we die and become dust and bones, shall we indeed (be raised up) to receive reward or punishment (according to our deeds)?, (The man) said: "Will you look down?" So he looked down and saw him in the midst of the Fire. He said: "By Allah! You have nearly ruined me. "Had it not been for the Grace of my Lord, I would certainly have been among those brought forth (to Hell)." (Allah informs about that true believer that he said): "Are we then not to die (any more)? "Except our first death, and we shall not be punished? (after we have entered Paradise)." Truly, this is the supreme success! For the like of this let the workers work."
[As-Saaffaat:50-61]
And He, the Majestic and Lofty, said:
(وَٱصْبِرْ نَفْسَكَ مَعَ ٱلَّذِينَ يَدْعُونَ رَبَّهُم بِٱلْغَدَوٰةِ وَٱلْعَشِىِّ يُرِيدُونَ وَجْهَهُۥۖ وَلَا تَعْدُ عَيْنَاكَ عَنْهُمْ تُرِيدُ زِينَةَ ٱلْحَيَوٰةِ ٱلدُّنْيَاۖ وَلَا تُطِعْ مَنْ أَغْفَلْنَا قَلْبَهُۥ عَن ذِكْرِنَا وَٱتَّبَعَ هَوَىٰهُ وَكَانَ أَمْرُهُۥ فُرُطًا)
"And keep yourself (O Muhammad ﷺ) patiently with those who call on their Lord (i.e. your companions who remember their Lord with glorification, praising in prayers, etc., and other righteous deeds, etc.) morning and afternoon, seeking His Face, and let not your eyes overlook them, desiring the pomp and glitter of the life of the world; and obey not him whose heart We have made heedless of Our Remembrance, one who follows his own lusts and whose affair (deeds) has been lost."
[Al-Kahf:28]
And the evidences from the Quran are many.
And from the Sunnah is the Hadith of Abu Musa Al-Ash'ari, may Allah be pleased with him, that the Prophet ﷺ said:
(مَثَلُ الْجَلِيسِ الصَّالِحِ وَالْجَلِيسِ السَّوْءِ، كَحَامِلِ الْمِسْكِ وَنَافِخِ الْكِيرِ ؛ فَحَامِلُ الْمِسْكِ إِمَّا أَنْ يُحْذِيَكَ، وَإِمَّا أَنْ تَبْتَاعَ مِنْهُ، وَإِمَّا أَنْ تَجِدَ مِنْهُ رِيحًا طَيِّبَةً، وَنَافِخُ الْكِيرِ إِمَّا أَنْ يُحْرِقَ ثِيَابَكَ، وَإِمَّا أَنْ تَجِدَ رِيحًا خَبِيثَةً)
"The likeliness of a good companion and a bad companion is that of someone selling Musk and a blacksmith, the one selling Musk he either gives it to you, or he sells it to you, or you either find a pleasang smell from him. And the blacksmith he either burns your clothes or you find a putrid smell from him."
Agreed upon.