Cleanliness is from Faith by Darussalam is a very interesting booklet on the importance of purification and cleanliness in Islam. It highlights the verses of Quran and authentic hadiths of the Messenger of Allah (peace be upon him) that speak about purification and explains that how the concept of cleanliness in Islam goes beyond the physical aspects of this world. It asserts the importance of the purification of thoughts, the spirit, and the body. It is a must-read for everyone looking for authentic Islamic rulings on cleanliness.
