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A man may vow that he would drink wine, or a woman may pledge that she would fast when she is in the period. These are forbidden actions and such pledges must be ignored and never fulfilled.
Pledges may be valid or invalid; permissible or forbidden; binding or worthless. A pledge is valid and binding if it involves something good, such as a voluntary act of worship, with the pledging person hoping to earn Allah’s pleasure.
Allah, in His mercy, has made clear a way to go back on one’s oath and release oneself from its import. Allah says: ‘Allah has already ordained for you [believers] a way to release you from such oaths’ (66: 2).