that a man came to the Prophet (saw); he had performed ablution and has missed a spot the size of a fingernail where water had not reached. The Prophet (saw) said to him: 'Go back and perform ablution properly.'" (Sahih) Report Mistake | Permalink
Hadith No: 666 Narrated/Authority of Umar bin Al-Khattab
"The Messenger of Allah (saw) saw a man performing ablution and he missed a spot the size of a fingernail on his foot. He commanded him to repeat his ablution and his prayer, so he did." (Sahih) Report Mistake | Permalink