It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him): I was walking with the Prophet (peace and blessings be upon him) when he (peace and blessings be upon him) said: "O my dear son, ask for water for ablution for me from this house." So I said (going to the people of the house): The Messenger of Allah (peace and blessings be upon him) is asking for water for ablution. At this he (the owner of the house) said: Inform him that his bucket is made of the hide of a dead animal. Then the Messenger of Allah (peace and blessings be upon him) said: "Ask them whether they have tanned it and so purified it?" They replied: Yes. So he (peace and blessings be upon him) said: "Indeed, its tanning is its purification."
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الطهارة / 24
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف. » «أخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 490»