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The ruling on Purity of water if mixed with impurity less than two Qullahs [6]

Q : Does water become impure, when it is less than two Qullahs and is mixed with something impure like urine or excrement?
A : Jurists have differed regarding the ruling on this water.
(Part No. 10; Page No. 16)
Some of them are of the opinion that if water is less than two Qullah in volume and is mixed with something impure, it becomes impure even if its color, taste, or smell does not change. This is supported by the statement of the Prophet (peace be upon him): When there is enough water to fill two Qullahs (270 liters), it carries no impurity. [1] According to another report: “It will not be defiled.” Related to Imam Ahmad and the four of Ahl-ul-Sunan (authors of Hadith compilations classified by jurisprudential themes). Ibn Khuzaymah, Ibn Hibban, and Al-Hakim ranked it as Sahih (authentic).
They are of the opinion that this Hadith indicates that if water is less than two Qullahs in volume, it becomes impure when mixed which something impure, even if its characteristic features are not changed.
Some other scholars are of the opinion that reliance on the implied meaning is not reliable enough.
The correct opinion is that the volume of water, which is less than two Qullahs does not become impure except when its characteristic features are changed, as that which is up to two Qullahs relying on the statement of the Prophet (peace be upon him): Water is pure and is not defiled by anything. [2] Related by Imam Ahmad, , Abu Dawud , Al-Tirmidhy , and Al-Nasa'y with an authentic chain of narration from the Hadith of Abu Sa`id Al-Khudry (may Allah be pleased with him). The Prophet (peace be upon him) specified two Qullahs to indicate that the volume which is less than this amount needs much examination and care, because it absolutely becomes impure according to the above mentioned Hadith of Abu Sa‘id Al-Khudry.
It could be deduced that the extremely small quantity of water is likely to be changed by impurity. That is why it should be disposed of and take care not to use it. It was authentically reported that the Prophet ( peace be upon him) said: When a dog licks a utensil belonging to any one of you, (whatever is in it) should be thrown away and then (the utensil) washed seven times. [3] Related by Muslim in his Sahih.
(Part No. 10; Page No. 17)
This Hadith indicates that vessels, which people commonly use, are often small in size and easily affected by the saliva of dogs and of holding impurities even if these impurities are small. Thus it is obligatory to pour out what they contain if any Najasah (ceremonial impurity) that falls into it as a means of caution and avoiding doubt in accordance with the statement of the Prophet ( peace be upon him) Leave what causes you doubt and turn to what does not cause you doubt. [4] The Prophet (may Allah's Peace and Blessings be upon him) also says: "Whoever guards against doubtful matters keeps his religion and honor blameless...'' [5] .
May Allah grant us success.