Giving an example of the difference in scholars' understanding of the texts.

The Shaykh : And there are many examples of this. Among them is that people differed regarding water: whether the categories of water are three or two. Some scholars said there are three categories: purifying, pure, and impure. Others said, rather, there are two categories: purifying and impure, and there is no category called "pure." For example: a man wakes up from his sleep at night and goes to the vessel containing water, so he dips his hand in the vessel. What do we say about this water in which the hand of the one who woke up from sleep was dipped?
The student: Purifying.

The Shaykh : The one who said that the categories are three said: This water is pure but not purifying. The one who said that water has two categories said: This water is purifying and purifies. This difference is not, in reality, a difference of hearts, but a difference of understanding. Each of the differing parties did what was obligatory upon him regarding looking into the matter, but he did not find a way to more than what his understanding reached. And the correct view in this issue is that water has two categories: one category is that which has changed in taste, color, or smell due to impurity, and it is impure. The other is purifying, which is that which has not changed due to impurity. Accordingly, the water in which the hand of the one who woke up from sleep at night was dipped is considered what?
The student: Purifying.

The Shaykh : Purifying; it is permissible to purify oneself with it, and it removes the state of ritual impurity.