Sahih Muslim Book - 2, Hadith - 570

و حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ حَدَّثَنَا جَرِيرٌ ح و حَدَّثَنَا إِسْحَاقُ أَخْبَرَنَا جَرِيرٌ عَنْ مَنْصُورٍ عَنْ هِلَالِ بْنِ يِسَافٍ عَنْ أَبِي يَحْيَى عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو قَالَ رَجَعْنَا مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مِنْ مَكَّةَ إِلَى الْمَدِينَةِ حَتَّى إِذَا كُنَّا بِمَاءٍ بِالطَّرِيقِ تَعَجَّلَ قَوْمٌ عِنْدَ الْعَصْرِ فَتَوَضَّأُوْا وَهُمْ عِجَالٌ فَانْتَهَيْنَا إِلَيْهِمْ وَأَعْقَابُهُمْ تَلُوحُ لَمْ يَمَسَّهَا الْمَاءُ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَيْلٌ لِلْأَعْقَابِ مِنْ النَّارِ أَسْبِغُوا الْوُضُوءَ.

It was narrated that 'Abdullah bin 'Amr said: "We came back with the Messenger of Allah (s.a.w) from Makkah to Al-Madinah, and when we were at an oasis on the way, some people hastened at the time of 'Asr and performed Wudu' in a hurry. We came to them and their heels were visibly dry and had not been touched by water. The Messenger of Allah (s.a.w) said: 'Woe to the heels from the Fire! Do Wudu' properly.'"