Does a wife become forbidden to her husband if she did not inform him of her past before marriage, knowing that she repented of those sins which Allah concealed?

A servant must not mention the sins and transgressions that Allah decreed for him and that Satan made appealing to him, but rather conceal them from people. This is based on the saying of the Prophet, peace and blessings be upon him: "All of my ummah are pardoned except for those who publicize their sins." Concealing sins is also obligatory because covering them ensures safety from trivializing Allah's right and from the execution of hadd punishment or ta'zeer (discretionary punishment).

Accordingly, there is no obligation to inform the man of the details of past transgressions and violations. Instead, it suffices to say: "There were transgressions and matters that occurred previously, but I have repented to Allah Almighty from them, and it is not permissible for me to disclose them. We ask Allah to forgive me for them." The man's intention in his oath should be considered: if he intended to demand details, then he has broken his oath; if he did not intend this, then there is no breaking of the oath.