All divine religions prohibit extramarital affairs including fornication and adultery
In fact, all divine religions prohibit extramarital affairs including fornication and adultery. We observe that the prohibition of adultery is one of the Ten Commandments in the Torah. In the Bible, we read: “Thou shalt not commit adultery.” (Exodus 20:14)
The New Testament tells us that Jesus prohibited adultery among other sins. In the New Testament, we read the following verse: “He said to Him, ‘Which ones?’ Jesus said, ‘You shall not murder,’ ‘You shall not commit adultery,’ ‘You shall not steal,’ ‘You shall not bear false witness.’” (Matthew 19:18)
The New Testament also states that adulterers are included in those people who will not inherit the Kingdom of God. We read the following verses in the New Testament:
Do not be deceived: neither the sexually immoral, nor idolaters, nor adulterers, nor men who practice homosexuality, nor thieves, nor the greedy, nor drunkards, nor revilers, nor swindlers will inherit the kingdom of God. And such were some of you. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God. (1 Corinthians 6:9-11 (ESV))
Not only does the Qur’an prohibit adultery but also just approaching this sin. In the Qur’an, we read the following verse:
“And do not approach unlawful sexual intercourse. Indeed, it is ever an immorality and is evil as a way.” (Al-Israa’ 17:32)
Prophet Muhammad included adultery in the most cardinal sins. Ibn Mas`ud reported: “I asked the Messenger of Allah ‘Which sin is the most serious?’ He replied, ‘To attribute a partner to Allah, though He Alone has created you.’ I asked: ‘What next?’ He said, ‘To kill your child, fearing that he will share your food with you.’ I asked again, ‘What next?’ He said, ‘To commit adultery with your neighbor’s wife.’” (Al-Bukhari & Muslim)
Prophet Muhammad (peace be upon him) confirmed that a true believer cannot commit adultery and one cannot have faith in Allah while committing adultery. He said: “When an adulterer commits illegal sexual intercourse, then he is not a believer at the time he is doing it; and when somebody drinks an alcoholic drink, then he is not believer at the time of drinking, and when a thief steals, he is not a believer at the time when he is stealing; and when a robber robs and the people look at him, then he is not a believer at the time of doing it.” (Al-Bukhari)
Prophet Muhammad listed the spread of adultery as one of the portents of the Hour (the end of the world). He said: “The Hour will not be established” or said: “From among the portents of the Hour is that the religious knowledge will be taken away (by the death of religious scholars) and general ignorance (of religion) will appear; and the drinking of alcoholic drinks will be very common, and (open) illegal sexual intercourse will prevail, and men will decrease in number while women will increase so much so that, for fifty women there will be only one man to look after them.” (Al-Bukhari)
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References:
1- The Glorious Qur’an (Sahih International Translation)
2- Sahih Al-Bukhari
3- Sahih Muslim
4- The Holy Bible (Visit biblegateway.com)