Hadith 31

Sahih Bukhari

Book 4: Ablutions (Wudu')

Chapter 29

The washing of heels during ablution

باب غَسْلِ الأَعْقَابِ

Whenever Ibn Sirin performed ablution, he used to wash the place that was under the ring. ​​
وَكَانَ ابْنُ سِيرِينَ يَغْسِلُ مَوْضِعَ الْخَاتَمِ إِذَا تَوَضَّأَ.
Sahih al-Bukhari 165
حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ زِيَادٍ، قَالَ سَمِعْتُ أَبَا هُرَيْرَةَ ـ وَكَانَ يَمُرُّ بِنَا وَالنَّاسُ يَتَوَضَّئُونَ مِنَ الْمِطْهَرَةِ ـ قَالَ أَسْبِغُوا الْوُضُوءَ فَإِنَّ أَبَا الْقَاسِمِ صلى الله عليه وسلم قَالَ ‏ ‏‏.‏
"‏ وَيْلٌ لِلأَعْقَابِ مِنَ النَّارِ ‏"
Muhammad Ibn Ziyad:

I heard Abu Huraira saying as he passed by us while the people were performing ablution from a utensil containing water, "Perform ablution perfectly and thoroughly for Abul-Qasim (the Prophet) said, 'Save your heels from the Hell-fire.' "