Is it permissible to dig one or two graves to bury the dead in them, then, after the body decomposes, to exhume the bones and place them in a designated pit, and then bury another deceased person in the same grave, due to scarcity of space?

It is not permissible to exhume a grave and remove the bones of the deceased from it until the deceased has completely disintegrated, at which point another deceased person may be buried in it. If there is a necessity to bury two deceased persons in one grave, it is permissible to do so, provided that the bones of the first deceased person are not removed; rather, they should be placed to one side and the second person buried alongside them. Cooperation is necessary to provide sufficient burial spaces for each deceased person separately.