Is it obligatory for the man and the woman to repent or to do Istibra' (a short waiting period to ensure non-pregnancy) due to brief private meetings without desire after a minor irrevocable divorce (baynunah sughra) and before renewing the marriage contract, given that the man was aware of the impermissibility of her staying in his house?

A irrevocably divorced woman becomes a stranger to her ex-husband, so it is not permissible for him to live with her in the same house, nor to be alone with her. They must repent and rectify the situation. If this was not the third divorce, he may marry her again, and her guardian may appoint someone to conduct her marriage. The aforementioned seclusion does not necessitate a waiting period (istibra’).