Expanding a Mosque into the Land of Another Mosque
There are two mosques which are built next to each other, one for summer and the other for winter, and the winter mosque is too small to meet the needs of people particularly in the month of Muharram; is it permissible to expand the winter mosque by taking some space from the summer mosque?
It is not permissible based on the obligatory precaution; however you can open a door from one mosque to the other.