Istinja is the process of cleaning oneself after relieving oneself (using the toilet). It is a fundamental part of "Thaharah" (ritual purity), as a clean body is a prerequisite for the validity of the five daily prayers. Istinja is ideally performed with water, but it can also be done using clean, dry materials like stones or tissue if water is unavailable. Islam places great emphasis on the etiquette of Istinja, including using the left hand and ensuring total hygiene, reflecting the religion's comprehensive concern for physical health, self-respect, and spiritual readiness. The practice of Istinja is a physical manifestation of the Islamic principle that "Cleanliness is half of faith." By ensuring the removal of all impurities from the body, the believer prepares themselves for a state of ritual purity (Wudu). Following the Sunnah, using water is considered the most thorough and superior method of purification. This daily habit helps prevent infections and maintains a sense of physical and mental freshness, allowing the Muslim to approach their acts of worship with a body that is as pure as the intention in their heart. Istinja is derived from the Arabic root "naja," meaning to be saved or to be safe. In Islamic terminology, it refers to removing impurities (najas) from the body after using the toilet. The Prophet (peace be upon him) taught the proper method: using water to clean, using the left hand (not the right), and using an odd number of stones or wipes if water is unavailable. He said: "When you go to relieve yourself, do not face the Qiblah nor turn your back to it" (Bukhari, Muslim). This shows the etiquette of the bathroom. He also taught that one should not use the right hand to clean oneself, nor use animal dung or bones as cleaning materials (since they are impure or used by jinn). The use of water is preferred. Aisha (RA) reported: "Tell your husbands to clean themselves with water, for I am too shy to tell them. The Prophet used to do so" (Tirmidhi). Water provides the most thorough purification. The Prophet also taught a supplication before entering the bathroom: "O Allah, I seek refuge in You from male and female devils" (Bukhari). And after leaving: "I seek Your forgiveness. Praise be to Allah who has relieved me of what was harmful and kept me healthy" (Ibn Majah). Istinja is an act of worship. When done with the intention of following the Prophet and purifying oneself for prayer, it becomes a rewardable act. It also teaches discipline and mindfulness,even the most private acts are done in a way that pleases Allah. For Muslims, Istinja is a daily practice that reinforces the Islamic emphasis on purity, both physical and spiritual. It reminds that worship involves the whole body and that cleanliness is a prerequisite for standing before Allah. The Prophet said: "Cleanliness is half of faith" (Muslim), and Istinja is a key part of that cleanliness.