"In the great classic of Sunni law, the Durr-ul-Mukhtar, the work that is treated as gospel by so many of our authorities giving fatwas, we read: A husband says, ‘If my wife’s mother does not come to me tonight, my wife is divorced,’ and there are witnesses who testify that, indeed, the mother did not come to him in the night, the wife is out."
January 1, 1970
https://en.wikiquote.org/wiki/Radd_al-Muhtar