Such a marriage is invalid as the Prophet said, salla Allahu alaihi wa sallam.

I did nikah without her mehram to avoid zina soo is marriage valid or not? because i got to know that if u think u will commit zina and u do nikah without mehram its all valid.

Invalid Marriages | April 10, 2017 3:46 am
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This guy proposed me to marry him and I accept it. He talked to my parents and they agreed. He arranged already the date for our wedding. My question is, It is true that when a guy ask u to marry him and you accept it, in Islam it is consider that u married already?
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THE DAUGHTER OF MY SISTER RAN AWAY AND MARRIED WITHOUT PERMISSION FROM HER PARENTS. NOW MY SISTER AND BROTHER IN LAW ARE NOT MEETING SHE AND HER HUSBAND. CAN THEY BOYCOT HER IN ISLAM.