Aslam, the freed slave of Sayyiduna Umar (may Allah be pleased with him), narrates: Water used to be heated for Sayyiduna Umar (may Allah be pleased with him) in a pitcher, and he would perform ghusl (ritual bath) with that water. The chain of this hadith is "sahih" (authentic).

Lady Aisha (may Allah be pleased with her) narrates: Once the Prophet Muhammad (peace be upon him) came to me, and during that time I had heated some water in the sun. The Prophet (peace be upon him) said: "O fair one! Do not do so, because as a result of this, leukoderma (vitiligo) can occur." This narration is extremely "gharib" (rare/strange), and its narrator Khalid bin Ismail is "matrook" (abandoned).

Lady Aisha (may Allah be pleased with her) narrates: The Noble Prophet (peace and blessings be upon him) forbade performing ablution with water that has been left in the sun, or bathing with it. The Noble Prophet (peace and blessings be upon him) said: "As a result of this, leukoderma (vitiligo) may occur." The narrator of this narration, Umar bin Muhammad Asam, is considered unreliable in hadith. No one else besides him has narrated this from Faleeh, and regarding its attribution to Zuhri, this hadith is not authentic.

Hassan bin Azhar narrates: Sayyiduna Umar bin Khattab (may Allah be pleased with him) said: "Do not perform ghusl (ritual bath) with water heated by the sun, because it may cause vitiligo (leucoderma)."