Al-Imām al-Bukhārī - upon whom be mercy - narrates: Ādam ibn Abī Ilyās narrated to us; he said: Shu’bah narrated to us; he said: Muḥammad ibn Ziyād narrated to us; he said:
I heard Sayyidunā Abū Hurayrah - may Allāh Almighty be content with him - as he passed by us while people were performing ablution from a water vessel. He said: “Perform ablution thoroughly and completely, for Abū al-Qāsim ﷺ has said: ‘Woe to the heels from the punishment of the Fire!’”
حدَّثنا آدَمُ بنُ أَبِي إِياسٍ، قالَ: حدَّثنا شُعْبَةُ، قالَ: حدَّثنا مُحَمَّدُ بنُ زِيادٍ، قالَ: سَمِعْتُ أَبَا هُرَيْرَةَ، وَكانَ يَمُرُّ بِنا والنَّاسُ يَتَوَضَّؤُونَ مِنَ المِطْهَرَةِ، قالَ: أَسْبِغُوا الوُضُوءَ؛ فَإِنَّ أَبا القاسِمِ ﷺ قالَ
وَيْلٌ لِلأَعْقابِ مِنَ النَّارِ.
Reference: Sahih Al Bukhari 165