Ibn Rajab al -Hanbali, through his book, which was entitled to the provisions of the difference in the vision of the crescent of Dhu al -Hijjah, told a jurisprudential incident that occurred in his time, and that he is the cloud of the crescent of Dhu al -Hijjah in the aforementioned year, so people completed the month of Dhu al -Qi'dah, then the people spoke to see the crescent of Dhu al -Hijjah. Rajab: It was witnessed by people whose ruler did not hear their testimony, and the situation continued to complete several months of Dhu al -Qi'dah, so some people stopped fasting on the day of Arafa. They said: It is the day of slaughter on what was told by those witnesses who did not accept their testimony, and it was said: Some of them sacrificed that day, and people occurred because of this turmoil. The ruler responded in this matter the witnesses and they are enemy without an apparent excuse, and this led to the difference of people, between those who take this testimony, and whoever wants it according to the choice of the ruler, and from here the people were disturbed in the matter, and he was sent to the authorship of Ibn Rajab this message and the purpose of it is discussing the issue Jurisprudence and the presentation of evidence for such a situation in jurists.