Recently I heard a debate regarding Mutah marriage concerning the permission of existing wife. Could you elaborate if a husband needs to obtain the consent or permission of his existing wife to do temporary marriage or Mutah? Further does he needs to obtain his wife’s permission for doing another permanent marriage or Nikah. Also does the condition changes, if his existing wife is Syed.

This is required if you want to do muta with a non Muslim woman. However, S. Sistani says that you can not – as mandatory precaution- get married with non Muslim lady even with your wife's permission.