The Bible does indeed contain teachings about sexual morality and the importance of fidelity in marriage. Adultery, which includes engaging in sexual relations with a married person outside of marriage, is considered a sin in many religious traditions, including Christianity.
Regarding your question about not knowing the person's marital status, the Bible does not provide explicit guidance on every possible scenario. However, it does emphasize the importance of living a life of integrity, honesty, and respecting others. In situations where someone is unaware of another person's marital status and unintentionally becomes involved with a married individual, it is essential to recognize that sin involves both actions and intentions.
In the case of not knowing about the person's marriage, one might argue that the act itself may be unintentional, but it may still have consequences and cause harm to others. To address this, the Bible encourages individuals to live with wisdom and discernment, seeking to do what is right and just. If a person unknowingly becomes involved in such a situation, it is crucial for them to acknowledge any mistake, seek forgiveness from God, and endeavor to make amends where possible.
In Christianity, forgiveness and redemption are core aspects of faith. If someone realizes they have sinned unintentionally, they can seek forgiveness through prayer, repentance, and a commitment to avoid such situations in the future. It is also recommended to confess one's sins and seek guidance from spiritual leaders or mentors to grow in faith and understanding.
Ultimately, it is essential to approach these matters with a compassionate and repentant heart, seeking to learn from our mistakes and strive for a life that aligns with the principles of love, respect, and faithfulness taught in the Bible.