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'Umar b. Khattab said that a person performed ablution and left a small part equal to the space of a nail (unwashed). The Messenger of Allah (ﷺ) saw that and said: Go back and perform ablution well. He then went back (performed ablution wel

A man came to the Prophet; he had performed ablution and has missed a spot the size of a fingernail where water had not reached. The Prophet (ﷺ) said to him: 'Go back and perform ablution properly.'"

"The Messenger of Allah saw a man performing ablution and he missed a spot the size of a fingernail on his foot. He commanded him to repeat the ablution and his prayer, so he did."

Allah’s Messenger (ﷺ) said that, “If one of you sits between her legs (of a woman) and penetrates her, Ghusl (bath) is obligatory.” [Agreed upon].