﴿ وَٱلَّذِينَ لَا يَدْعُونَ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَ وَلَا يَقْتُلُونَ ٱلنَّفْسَ ٱلَّتِى حَرَّمَ ٱللَّهُ إِلَّا بِٱلْحَقِّ وَلَا يَزْنُونَ ۚ وَمَن يَفْعَلْ ذَٰلِكَ يَلْقَ أَثَامًۭا ﴾

“and who never invoke any [imaginary] deity side by side with God, and do not take any human beings life - [the life] which God has willed to be sacred - otherwise than in [the pursuit of] justice, and do not commit adultery. And [know that] he who commits aught thereof shall [not only] meet with a full requital”

Three sins have been mentioned in this verse—polytheism, the killing of a person without justification and adultery. These three forms of wrongdoing are great sins against God and His subjects. The sign of real faith in God is that a man abstains from them. Those who have indulged in these sins can save themselves from retribution by repentance, but for those who die without repenting and reforming, there will be severe punishment before God at God’s behest, which they will in no way be able to avoid.