Najasah refers to the concept of impurity in Islamic jurisprudence. It encompasses substances or items that are considered ritually unclean, which can affect a person's ability to perform prayers and other acts of worship. Common examples of najasah include blood, urine, and certain animal excretions. In Islamic practice, it is essential to remove najasah before engaging in prayer or other religious activities. This purification process often involves washing the affected area or item with water. Understanding najasah helps Muslims maintain spiritual cleanliness and adhere to the guidelines of their faith.