Waqf is a good deed dedicated by waqif (the person who gives waqf) to his property to nadlir (administrators / recipients of waqf) so that the object can be used by the general public. After the waqf pledge was stated by waqif, then from that moment the ownership of the object was moved to Allah, meaning that the general public now has the right to benefit the object that is represented (mauquuf). The concept that is commonly understood by society as told by the jurists (jurisprudence experts) in some literacies, that waqf is holding back property and using it in the way of Allah, said Sayyid Sabiq in his Sunnah fiqh. On the other hand this opinion is reinforced by the hadith narrated by Ibn Umar whose hadith chunks state: "If you want to, forgive the land and give the results. Then Umar converted his land in Khaibar with the understanding that it should not be sold, granted and inherited". From the statement of the hadith, the understanding was that waqf was eternal and not limited by time (ta'biid - forever). But in other literacy, it was found a statement that waqf may be limited by time (muaqqot), this opinion was stated by Imam Malik. This means that people may endow their land for a certain period of time. And even this, by him is considered legitimate as a waqf contract that is not limited by time. This paper tries to look at these two opinions and analyze them and conclude to draw the red thread caused by the law.