"I said: 'O Messenger of Allah, which sin is most grievous?' He said: 'Setting up a rival to Allah while it is He that created you.' I said: 'Then what?' He said: 'Killing your child so that he will not eat with you.' I said: 'Then what?' He said: 'Committing adultery with your neighbor's wife.'"  

قُلْتُ يَا رَسُولَ اللَّهِ أَىُّ الذَّنْبِ أَعْظَمُ قَالَ أَنْ تَجْعَلَ لِلَّهِ نِدًّا وَهُوَ خَلَقَكَ قُلْتُ ثُمَّ أَىٌّ قَالَ أَنْ تَقْتُلَ وَلَدَكَ مِنْ أَجْلِ أَنْ يَطْعَمَ مَعَكَ قُلْتُ ثُمَّ أَىٌّ قَالَ ثُمَّ أَنْ تُزَانِيَ بِحَلِيلَةِ جَارِكَ  

I asked the Prophet, "What is the greatest sin in the Sight of Allah?" He said, "That you set up a rival unto Allah though He Alone created you." I said, "That is indeed a great sin." Then asked, "What is next?" He said, "To kill your son lest he should share your food with you." I asked, "What is next?" He said, "To commit illegal sexual intercourse with the wife of your neighbor." (Using translation from Bukhārī 4477)  

سَأَلْتُ رَسُولَ اللَّهِ ﷺ أَيُّ الذَّنْبِ أَعْظَمُ؟ قَالَ «أَنْ تَجْعَلَ لِلَّهِ نِدًّا وَهُوَ خَلَقَكَ» قُلْتُ إِنَّ ذَلِكَ لَعَظِيمٌ ثُمَّ أَيُّ؟ قَالَ «أَنْ تَقْتُلَ وَلَدَكَ مَخَافَةَ أَنْ يَطْعَمَ مَعَكَ» قُلْتُ ثُمَّ أَيُّ؟ قَالَ «أَنْ تُزَانِيَ حَلِيلَةَ جَارِكَ»  

"I said: 'O Messenger of Allah, which sin is most grievous?' He said: 'Setting up a rival to Allah while it is He that created you.' I said: 'Then what?' He said: 'Killing your child so that he will not eat with you.' I said: 'Then what?' He said: 'Committing adultery with your neighbor's wife.'" (Using translation from Nasāʾī 4014)  

قُلْتُ يَا رَسُولَ اللهِ أَيُّ الذَّنْبِ أَعْظَمُ؟ قَالَ «أَنْ تَجْعَلَ لِلَّهِ نِدًّا وَهُوَ خَلَقَكَ» قُلْتُ ثُمَّ أَيُّ؟ قَالَ «ثُمَّ أَنْ تَقْتُلَ وَلَدَكَ مِنْ أَجْلِ أَنْ يَطْعَمَ مَعَكَ» قُلْتُ ثُمَّ مَاذَا؟ قَالَ «ثُمَّ أَنْ تُزَانِيَ حَلِيلَةَ جَارِكَ»  

"أعْظَمُ الذَّنْبِ عند الله أن تجْعَلَ لله نِدًّا، وهو خَلَقَكَ، ثم أن تقتلَ ولدَكَ مَخافَة أن يَطْعمَ مَعَك، ثم أن تُزَانِي حَليلةَ جارِك".