Hazrat Ibn Umar (may Allah be pleased with them both) says that if a woman is not affected by menstruation or impurity, then there is no harm in what she leaves behind.

Ibrahim says that there is no harm in what a woman leaves behind.

Hazrat Ikrimah says that there is no harm in performing ablution with the leftover water which a woman has used for ablution.

Hazrat Ata was asked about performing ablution with the leftover water of a menstruating woman, so he replied that there is no harm in it.

Hazrat Abdullah bin Abbas (may Allah be pleased with them both) narrates that once one of the noble wives of the Prophet Muhammad (peace and blessings be upon him) performed ghusl (ritual bath) from a large vessel of water. When the Prophet Muhammad (peace and blessings be upon him) intended to perform ghusl or wudu from that water, she said, "O Messenger of Allah! I was in a state of janabah (major ritual impurity)." He replied, "Water does not become impure."

A companion from the tribe of Ghifar narrates that the Noble Prophet (peace and blessings be upon him) forbade performing ablution with water left over by a woman.

Hazrat Sawadah bin Asim says that I met Hakam Ghafari at the place of Marbad. He used to forbid people from (using) the leftover water of a woman. I said to him, "How beautiful is the yellowness of a woman's arms!" He grabbed something and threw it angrily and said, "It will be good for you and your companions."

Hazrat Kulthum bint Amir narrates that once Juwayriya bint Harith performed ablution, and when I wanted to perform ablution with the leftover water, she stopped me.

Hazrat Saeed bin Al-Musayyib and Hasan Basri considered performing ablution with water left over by a woman as undesirable.

Hasan says that a man has been prohibited from performing ablution with water left over by a woman.