Is It Valid to Reduce or Increase the Amount Vowed for Imam Hussein?
A vow must be fulfilled according to the intention, time, place, and amount specified when it was made. If an emergency prevents this, the vow may be fulfilled once the situation has passed. If the appointed time has gone by, the vow remains due for the following year. Without a valid reason, reducing or increasing the amount, or changing the time, is not permissible.