﴿أَلاَّ تُشْرِكُواْ بِهِ شَيْئاً﴾

(Join not anything in worship with Him;) this Allah has ordained, for He said at the end of the Ayah,

﴿ذلِكُمْ وَصَّـكُمْ بِهِ لَعَلَّكُمْ تَعْقِلُونَ﴾

(This He has commanded you that you may understand.) In the the Two Sahihs, it is recorded that Abu Dharr said that the Messenger of Allah said,

«أَتَانِي جِبْرِيلُ فَبَشَّرَنِي أَنَّهُ مَنْ مَاتَ لَا يُشْرِكُ بِاللهِ شَيْئًا مِنْ أُمَّتِكَ دَخَلَ الْجَنَّةَ، قُلْتُ وَإِنْ زَنَى وَإِنْ سَرَقَ؟ قَالَ: وَإِنْ زَنَى وَإِنْ سَرَقَ، قُلْتُ: وَإِنْ زَنَى وَإِنْ سَرَقَ؟ قَالَ: وَإِنْ زَنَى وَإِنْ سَرَقَ، قُلْت: وَإِنْ زَنَى وَإِنْ سَرَقَ؟ قَالَ: وَإِنْ زَنَى وَإِنْ سَرَقَ وَإِنْ شَرِبَ الْخَمْر»

(Jibril came to me and conveyed the good news that, "Whoever among your followers dies, worshipping none along with Allah, will enter Paradise." I said, "Even if he stole or committed illegal sexual intercourse'' He said, "Even if he stole or committed illegal sexual intercourse." I said, "Even if he stole or committed illegal sexual intercourse" He said, "Even if he stole or committed illegal sexual intercourse." I said, "Even if he stole or committed illegal sexual intercourse" He said, "Even if he stole or committed illegal sexual intercourse or even if drank alcohol.") Some of the Musnad and Sunan compilers recorded that Abu Dharr said that the Messenger of Allah said,

«يَقُولُ تَعَالَى: يَا ابْنَ آدَمَ إِنَّكَ مَا دَعَوْتَنِي وَرَجَوْتَنِي فَإِنِّي أَغْفِرُ لَكَ عَلَى مَا كَانَ مِنْكَ وَلَا أُبَالِي،وَلَوْ أَتَيْتَنِي بِقُرَابِ الْأَرْضِ خَطِيئَةً أَتَيْتُكَ بِقُرَابِهَا مَغْفِرَةً مَا لَمْ تُشْرِكْ بِي شَيْئًا، وَإِنْ أَخْطَأْتَ حَتَّى تَبْلُغَ خَطَاَياكَ عَنَانَ السَّمَاءِ ثُمَّ اسْتَغْفَرْتَنِي غَفَرْتُ لَك»

(Allah said, `O Son of Adam! As long as you supplicate to Me and hope of Me, I will forgive whatever you committed, and it will be easy for Me to do that. And even if you brought the earth's fill of sins to Me, I will bring forth its fill of forgiveness, as long as you do not associate anything or anyone in worship with Me. And even if you err and your errors accumulate until they reach the boundaries of the sky and you then ask Me for forgiveness, I will forgive you.') This subject is also mentioned in the Qur'an, for Allah said,

﴿إِنَّ اللَّهَ لاَ يَغْفِرُ أَن يُشْرَكَ بِهِ وَيَغْفِرُ مَا دُونَ ذَلِكَ لِمَن يَشَآءُ﴾

(Verily, Allah forgives not (the sin of) setting up partners (in worship) with Him, but He forgives whom He wills, sins other than that.) ﴿4:116﴾ Muslim recorded a Hadith in the Sahih that reads,

«مَنْ مَاتَ لَا يُشْرِكُ بِاللهِ شَيْئًا دَخَلَ الْجَنَّـة»

(Whoever dies associating none with Allah will enter Paradise.) There are many Ayat and Hadiths on this subject.