Divorce Conditional on the Wife's Departure

Question
A husband swore an oath that if his wife leaves, she is considered divorced. After that, a quarrel occurred between them, and then he took her to her family's house. Does the divorce take effect, and does he owe a expiation?
Answer
I say, and with God's help: If he means when he conditions the divorce on such an exit, then the divorce takes place. It appears that he does not mean such an exit, and he should refer to the mufti to clarify the situation. God knows best.
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