One who performed ablution and left a place where water did not reach.

It was narrated from Anas that:

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.'"

حَدَّثَنَا حَرْمَلَةُ بْنُ يَحْيَى، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، حَدَّثَنَا جَرِيرُ بْنُ حَازِمٍ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ رَجُلاً، أَتَى النَّبِيَّ ـ صلى الله عليه وسلم ـ وَقَدْ تَوَضَّأَ وَتَرَكَ مَوْضِعَ الظُّفْرِ لَمْ يُصِبْهُ الْمَاءُ فَقَالَ لَهُ النَّبِيُّ ـ صلى الله عليه وسلم ـ ‏

‏ ارْجِعْ فَأَحْسِنْ وُضُوءَكَ ‏

‏ ‏.‏

It was narrated that 'Umar bin Khattab said:

"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."

حَدَّثَنَا حَرْمَلَةُ بْنُ يَحْيَى، حَدَّثَنَا ابْنُ وَهْبٍ، ح وَحَدَّثَنَا ابْنُ حُمَيْدٍ، حَدَّثَنَا زَيْدُ بْنُ الْحُبَابِ، قَالاَ حَدَّثَنَا ابْنُ لَهِيعَةَ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، عَنْ عُمَرَ بْنِ الْخَطَّابِ، قَالَ رَأَى رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ رَجُلاً تَوَضَّأَ فَتَرَكَ مَوْضِعَ الظُّفْرِ عَلَى قَدَمِهِ فَأَمَرَهُ أَنْ يُعِيدَ الْوُضُوءَ وَالصَّلاَةَ ‏.‏ قَالَ فَرَجَعَ ‏.‏