What is the greatest sin?

يَا حَسْرَةً عَلَى الْعِبَادِ ۚ مَا يَأْتِيهِم مِّن رَّسُولٍ إِلَّا كَانُوا بِهِ يَسْتَهْزِئُونَ
How sorry is the people's condition! Every time a messenger went to them, they always ridiculed him Qur'an 30:32 

 

Why Won’t you Think? 

Allah has very unflattering words for those who do not think:-

إِنَّ شَرَّ الدَّوَابَّ عِندَ اللّهِ الصُّمُّ الْبُكْمُ الَّذِينَ لاَ يَعْقِلُونَ
 Truly, the worst of all creatures in the sight of Allah are the deaf,dumb, those who do not use their reason......Qur'an 8:22

وَقَالُوا لَوْ كُنَّا نَسْمَعُ أَوْ نَعْقِلُ مَا كُنَّا فِي أَصْحَابِ السَّعِيرِ
And they (those in hell) will say, "If only we had listened or reasoned, we would not be among the companions of the Blaze.".......Qur’an 67:10

 What to Think About?

 لَوْ أَنزَلْنَا هَٰذَا الْقُرْآنَ عَلَىٰ جَبَلٍ لَّرَأَيْتَهُ خَاشِعًا مُّتَصَدِّعًا مِّنْ خَشْيَةِ اللَّهِ وَتِلْكَ الْأَمْثَالُ نَضْرِبُهَا لِلنَّاسِ لَعَلَّهُمْ يَتَفَكَّرُونَ
If We had sent down this Qur'an upon a mountain you would have seen it humbled and coming apart from fear of Allah And these examples We present to the people that perhaps they will think .....Qur’an 59:21


أَفَلَا يَتَدَبَّرُونَ الْقُرْآنَ وَلَوْ كَانَ مِنْ عِندِ غَيْرِ اللَّهِ لَوَجَدُوا فِيهِ اخْتِلَافًا كَثِيرًا
 Then do they not consider the Qur'an? If it had been from [any] other than Allah, they would have found within it much contradiction.....Qur’an 4:82

وَلَا تَقْفُ مَا لَيْسَ لَكَ بِهِ عِلْمٌ إِنَّ السَّمْعَ وَالْبَصَرَ وَالْفُؤَادَ كُلُّ أُولَٰئِكَ كَانَ عَنْهُ مَسْئُولًا
 And do not pursue that of which you have no knowledge. Indeed, the hearing the sight and the mind, one will be questioned about all these.....Qur’an 17:36

كِتَابٌ أَنزَلْنَاهُ إِلَيْكَ مُبَارَكٌ لِّيَدَّبَّرُوا آيَاتِهِ وَلِيَتَذَكَّرَ أُولُو الْأَلْبَابِ
 [This is] a blessed Book which We have revealed to you, [O Muhammad], that they might reflect upon its verses and that those of understanding would be reminded......Qur’an 38:29
 
إِنَّ فِي خَلْقِ السَّمَاوَاتِ وَالْأَرْضِ وَاخْتِلَافِ اللَّيْلِ وَالنَّهَارِ لَآيَاتٍ لِّأُولِي الْأَلْبَابِ
 الَّذِينَ يَذْكُرُونَ اللَّهَ قِيَامًا وَقُعُودًا وَعَلَىٰ جُنُوبِهِمْ وَيَتَفَكَّرُونَ فِي خَلْقِ السَّمَاوَاتِ وَالْأَرْضِ رَبَّنَا مَا خَلَقْتَ هَٰذَا بَاطِلًا سُبْحَانَكَ فَقِنَا عَذَابَ النَّارِ
 رَبَّنَا إِنَّكَ مَن تُدْخِلِ النَّارَ فَقَدْ أَخْزَيْتَهُ وَمَا لِلظَّالِمِينَ مِنْ أَنصَارٍ
 Indeed, in the creation of the heavens and the earth and the alternation of the night and the day are signs for those of understanding.
 

Who remember Allah while standing or sitting or [lying] on their sides and give thought to the creation of the heavens and the earth, [saying], "Our Lord, You did not create this aimlessly; exalted are You [above such a thing]; then protect us from the punishment of the Fire.
 Our Lord, indeed whoever You admit to the Fire - You have disgraced him, and for the wrongdoers there are no helpers.......Qur’an 3:190-192

What is the greatest sin?

:عن ابن مسعود قل
“سَأَلْتُ رَسُوْلَ اللهِ صَلَّى اللهُ عَلَيْهِ وَ سَلَّمَ أَيُّ الْذَّنْبِ أَعْظَمُ, قَالَ: أَنْ تَجْعَلَ لِلهِ نِدّاً وَ هُوَ خَلَقَكَ”

 رَوَاهُ إِمَامٌ بُخَارِيٌ وَ إِمَامٌ مُسْلِمٌ

On the authority of Ibn Masood  he said “I asked the Messenger of Allaah (sallallaahu alayhi wa sallam), what is the greatest sin

He (sallallaahu alayhi wa sallam) said:

“That you set up partners with Allaah while He (Alone) created you.”

Reported by Imam Bukhari and Imam Muslim.

 

Further you may read:

Sahih Bukhari

Sahih Muslim

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