Validity of entering Ihram for two Hajj or two Umrah simultaneously

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If a person enters the state of Ihram for two Hajj or two Umrah, the Ihram is established for only one of them, and the other becomes null and void. This opinion is held by Malik and Al-Shafi'i. The evidence for this is that the two acts are distinct forms of worship, and the person is not obligated to proceed with both, thus their simultaneous entry into Ihram is invalid, analogous to two prescribed prayers.