Is the statement regarding the obligation to inquire about the impurity of water—if one doubts it—by analogy with inquiring about the Qibla, preponderant or weak? And what is the refutation of their evidence if it is weak?

If someone doubts the impurity of water, they may purify themselves with it because its original state is purity, and certainty is not removed by doubt. They are not obliged to inquire about its purity. The proof for this is that Umar ibn Al-Khattab, may Allah be pleased with him, did not ask the owner of a watering trough about the possibility of predators having visited it.

However, analogizing this to the Qibla is a flawed analogy, because whoever is ignorant of the direction of the Qibla has no original principle to build upon, nor can they determine it themselves. Thus, they must inquire, unlike water, whose original state is purity.