Knowing Islamic jurisprudence and its rulings on aspects of worship is one of the important things that every Muslim should take care of; because it is not possible for a Muslim to know the acts of worship assigned to him except with the knowledge and evidence of Islamic jurisprudence. One of the aspects related to the acts of worship practiced by a Muslim in his life is the aspect of ability, as it is considered the authority of the mandate in Islamic law, so there is no assignment except within the limits of the capabilities of the taxpayer. Islamic law came to the pleasure of man, not to impose legislations that impede him from carrying out the interests of his religion and worldly affairs, because it is able to absorb modern realities and new developments in every time and place. The problem arises in the lack of knowledge and lack of understanding, which results in excessive facilitation, or vice versa when we find intolerance and militancy, and with the tolerance of religion. For his followers left the foundations, and they adopted the branches. Therefore, the study aims to discuss the concept of being able, in addition to meandering the contraindications in the capacity of worship, fasting, and Hajj. Because it is one of the pillars of Islam. The research followed the descriptive approach, which is based on the legal texts (the Noble Qur’an, the noble Sunnah, and consensus) along with the comparative approach; Because the study is exposed to the four schools of the Sunnis and the community (Hanafi - Shafi’i - Hanbali - Maliki), and the research has concluded that the contraindications of ability are either physical like illness and event. Each of these cases has been detailed.
ability, physical barriers, illness, event, acts of worship