Abstract
Addressed in this research substitution in the book of Al-Shafi defined by the terms of the language and terminology, saying that it is stipulated that the scientists, the purpose of it, and scientists who looked after him, due to the difference in the number of letters, and the division of scientists has two parts, and they were Divisional issues of substitution in the book of healing, At the time, I remember the Qur'anic verse-precious, or Hadith, which deals with the two I'm ether phenomenon of substitution, commenting strong push by the persisting him the opinions of scientists _ if any _ in the matter, at the end to say come to him, saying that were not Issue famous, and so to This latest research, and ask Allah benefit the Muslims, praise be to Allah the Lord of El Alamein.
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