Beware of negnot washing your heels properly, for not doing so can lead to them being burnt in the Hellfire! So, perform your ablution thoroughly
عَنْ عَبْدِ اللهِ بْنِ عَمْرٍو رَضيَ اللهُ عنهما قَالَ: رَجَعْنَا مَعَ رَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ مِنْ مَكَّةَ إِلَى الْمَدِينَةِ حَتَّى إِذَا كُنَّا بِمَاءٍ بِالطَّرِيقِ تَعَجَّلَ قَوْمٌ عِنْدَ الْعَصْرِ، فَتَوَضَّؤُوا وَهُمْ عِجَالٌ، فَانْتَهَيْنَا إِلَيْهِمْ وَأَعْقَابُهُمْ تَلُوحُ لَمْ يَمَسَّهَا الْمَاءُ فَقَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «وَيْلٌ لِلْأَعْقَابِ مِنَ النَّارِ أَسْبِغُوا الْوُضُوءَ».
Explanation
The Prophet (may Allah's peace and blessings be upon him) traveled from Makkah to Madīnah with his Companions, and on their way they found water. Some of the Companions hurried to perform ablution for the ‘Asr prayer, so much so that the backs of their feet appeared to the observer to be dry. So, the Prophet (may Allah's peace and blessings be upon him) said: There will be punishment and destruction in Hellfire for those who fail to wash the backs of their feet during ablution.
He ordered them to perform ablution perfectly.
Source
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