Abu Huraira (may Allah be pleased with him) narrates that a man asked the Messenger of Allah (peace and blessings be upon him): O Messenger of Allah! When we travel by sea, we take only a little water with us. If we use it for ablution, we remain thirsty. Can we perform ablution with sea water? He replied: Its water is pure and its dead (animals) are lawful.

Sayyiduna Umar (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) was asked about water and the beasts that come to it (to drink). He said: If the water is more than two pitchers, it does not become impure.

The same narration from Sayyiduna Umar (may Allah be pleased with him) is also reported through another chain of transmission.

Asim bin Mundhir (may Allah have mercy on him) says that we were in our or Ubaidullah bin Abdullah bin Umar's (may Allah have mercy on him) garden when the time for prayer came. Ubaidullah got up and went to the pond in his garden and began to perform ablution, while there was a camel's skin lying in it. We said: You are performing ablution with this water, while this skin is lying in it. He said: My father told me that the Messenger of Allah (peace and blessings of Allah be upon him) said: If the water is two pitchers (or more), it does not become impure.

Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates that someone asked the Messenger of Allah (peace and blessings be upon him): Can we perform ablution from the well named Budha'ah, while filth, menstrual cloths, and the flesh of dogs are thrown into it? He replied: Water is pure; nothing can make it impure.

Narrated Abdullah bin Abbas (may Allah be pleased with them) that the Prophet Muhammad (peace be upon him) went to one of his wives, and there was some leftover water from her ablution or bath. The Prophet (peace be upon him) began to perform ablution with it. She said: O Messenger of Allah! I have performed ghusl (ritual bath) of janabah with it. He replied: Water does not become impure.

This narration is also reported through this chain.

Sayyiduna Abu Huraira (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: If a dog drinks from any of your vessels, then wash it seven times.

Sayyiduna Abu Huraira (may Allah be pleased with him) reports that the Noble Prophet (peace and blessings be upon him) said: When a dog puts its mouth into any of your vessels, then throw out (whatever is in) the vessel and wash the vessel seven times.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: When a dog drinks from any of your vessels by putting its mouth into it, then wash it seven times. Ayyub narrated from Ibn Sirin, from Sayyiduna Abu Hurairah (may Allah be pleased with him), these words as well: that the first time, or one time, wash it with earth.