…Is it compulsory to take bath and wear the Ihram at that time or is it ok to wear the Ihram later and the intention is good enough at that time? Or is it necessary to wear the Ihram in advance after taking bath and wait for the miqat to arrive?
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You must wear the Ihram clothes and make the intention at the meeqat. Taking the bath is a Sunnah and can be made before leaving your house to the airport.