Woe to the heels

Wash the feet completely; dry heels are warned of the Fire.

Narrated by Abdullah ibn Amr

The Prophet ﷺ saw people whose heels were dry after wudu and called out in a loud voice: "Woe to the heels from the Fire!" two or three times.

Sahih al-Bukhari 60, Sahih Muslim 241

What this hadith teaches

Every part of the wudu must be washed fully. A small dry patch on the heel, between the toes or on the elbows spoils the wudu.

Reference and grade

Grade
Sahih: agreed upon by al-Bukhari and Muslim
Narrator
Abdullah ibn Amr

The hadith in Arabic نص الحديث

وَيْلٌ لِلأَعْقَابِ مِنَ النَّارِ ‏"‏‏.‏ مَرَّتَيْنِ أَوْ ثَلاَثًا

Arabic text of Sahih al-Bukhari 60, as given on sunnah.com.