Quran and Hadith have reference concentrating the world as the tywo type but the terminology of Darul Islam and Darul Harb is not there. Darul Harb turns into Darul Islam ny the presence of such Islamic element as Friday Prayers and Eid Prayers. but how Darul Islam turns into Darul Harb there is diffrence of opinion among Ulema. https://medicalwarehouses.shop/product-category/stockings/