Analyzing a substance of hadits is the most crucial point in the way of interacts with hadits itself. We will be more understood about the content of hadits by using this way, not only written but also implicit. A part should be analyzed is a balance of what prophet Muhammad SAW say is with scientific fact nowadays. It make us admit that most of research now are related to hadits or sunnah Rasulullah SAW. Therefore, the relevance of hadits and science is called by I`Jaz Ilmi. I'jaz Ilmi in hadits can be seen in several parts, such as in health problem, medical science and other science. Say for example in health problem, there are many suggestions of our prophet that are related to medical science. Furthermore, analyzing hadits I`jazul Ilmi in part of I'jazul Hadist must be done by special people who have competence in this field, and based on the rules to give legitimation in that analyses. Using Hadist as a guidance is a must, because the first function of hadits is become a guidance in human life, without thinking about the relevance of hadits and science.

One of the most important aspects of learning thehaditsis the fiqhulhadits; a study which is related to meaning exploration and the principles that are contained in the texts of hadits or Sunnah. There ishandful of rejection of a hadits that are caused by the difficulty in understanding the meaning textually form thehaditsitself. Conversely, there are some cases where the wrong conclusion of theprinciple ofistinbat found from the messiness of methodology in understanding the hadits. We can agree on a statement that said the hadits of the prophet Sunnah will be able to apply in every space and time, but that cannot be stigmatized by a wrong methodology in interpreting so that the haditscan be a solution.

This paper is a literature study that seeks to explore the classical literature on the theory of ma'âlât Al-Afâl. This theory is a concept that focuses on efforts to read predictions of what will happen from an action taken, then the prediction will be used as a benchmark in establishing the law between allowed or prohibited. This theory has a high urgency in the contemporary ijtihad fiqih region, because the nature of contemporary jurisprudence itself tends to rely on benefit. It is the benefit prediction that can be used as a legal backing even though the consequences will be to leave the original law contained in the text. Besides mashlahah, there are several factors which require that the concept of ma'âlât Al-Af'âl is recognized in the realm of ijtihad, such as sad Al-Zarîah, Al-Dharûrah, raf`u Al-Haraj and ta`lil Al-Ahkâm. The conclusion obtained is that this predictive theory is really needed in solving contemporary problems, because the benchmark is the maqâshid syarîahah which leads to one word namely "benefit".