Is it forbidden for a wife to go to work without her husband's knowledge, or to tell him that she is working as a volunteer while she is actually receiving a salary?

Lying is forbidden except in three cases: reconciling people, during war, and a man's conversation with his wife and vice versa. The intention here is to show affection, not deception regarding rights. Therefore, it is not permissible to lie to the husband about work; he must be told the truth. If the husband permits, you may donate from your money to your sister's daughters, as a discerning wife has the right to dispose of her private wealth without her husband's permission. If he does not permit, obedience to him is obligatory, and the woman will be rewarded for her obedience and good intention.