Imam Baqir (peace be upon him): Allah revealed in Medina the verses concerning fornication: الزَّانِی لا یَنْکِحُ إِلَّا زانِیَةً أَوْ مُشْرِکَةً وَ الزَّانِیَةُ لا یَنْکِحُها إِلَّا زانٍ أَوْ مُشْرِکٌ وَ حُرِّمَ ذلِکَ عَلَی الْمُؤْمِنِینَ [The fornicating man marries none but a fornicating or a polytheist woman, and the fornicating woman — none marries her but a fornicating or a polytheist man; and this has been forbidden to the believers] (al-Nur/3). So Allah did not name the fornicating man or the fornicating woman as a believer. And the Messenger of Allah (peace be upon him and his family) — regarding whom none of the people of knowledge has any doubt that he said so — said: 'When the fornicator commits fornication, he is not a believer, and when the thief lays his hand on theft, he is not a believer, because when he commits this sin, faith is stripped from him just as a garment is stripped from the body.' And Allah revealed in Medina thus: وَ الَّذِینَ یَرْمُونَ الْمُحْصَناتِ ثُمَّ لَمْ یَأْتُوا بِأَرْبَعَةِ شُهَداءَ فَاجْلِدُوهُمْ ثَمانِینَ جَلْدَةً وَ لا تَقْبَلُوا لَهُمْ شَهادَةً أَبَداً وَ أُولئِکَ هُمُ الْفاسِقُونَ إِلَّا الَّذِینَ تابُوا مِنْ بَعْدِ ذلِکَ وَ أَصْلَحُوا فَإِنَّ اللهَ غَفُورٌ رَحِیمٌ [And those who accuse chaste women and then do not bring four witnesses [for their claim], flog them with eighty lashes and never accept their testimony, and they are the transgressors — except those who repent after that and make amends [for Allah forgives them], for indeed Allah is Forgiving, Merciful] (al-Nur/54). So as long as he persists in his slander, Allah has kept him far from being ascribed to faith. Allah the Mighty and Majestic says: أَ فَمَنْ کانَ مُؤْمِناً کَمَنْ کانَ فاسِقاً لا یَسْتَوُونَ [Is one who is a believer like one who is a transgressor? No, they are never equal] (al-Sajdah/18). And Allah has made him a hypocrite. Allah the Mighty and Majestic says: إِنَّ الْمُنافِقِینَ هُمُ الْفاسِقُونَ [Indeed the hypocrites — they are the transgressors] (al-Tawbah/67). And Allah the Mighty and Majestic has made him one of the followers of Iblis, and has said: إِلَّا إِبْلِیسَ کانَ مِنَ الْجِنِّ فَفَسَقَ عَنْ أَمْرِ رَبِّهِ [except Iblis; he was of the jinn, so he transgressed the commandment of his Lord]. And He made him accursed and said: إِنَّ الَّذِینَ یَرْمُونَ الْمُحْصَناتِ الْغافِلاتِ الْمُؤْمِناتِ لُعِنُوا فِی الدُّنْیا وَ الْآخِرَةِ وَ لَهُمْ عَذابٌ عَظِیمٌ یَوْمَ تَشْهَدُ عَلَیْهِمْ أَلْسِنَتُهُمْ وَ أَیْدِیهِمْ وَ أَرْجُلُهُمْ بِما کانُوا یَعْمَلُونَ [Indeed those who accuse chaste, unaware, believing women are far from divine mercy in this world and the Hereafter, and for them is a great punishment. On the day when their tongues, hands and feet bear witness against them concerning what they used to do] (al-Nur/23-24).