"The Messenger of Allah ﷺ saw some people whose heels were still dry, so he said: 'Woe to the heels from the Fire. Perform Wudu' properly.'"
رَأَى رَسُولُ اللَّهِ ﷺ قَوْمًا يَتَوَضَّئُونَ فَرَأَى أَعْقَابَهُمْ تَلُوحُ فَقَالَ وَيْلٌ لِلأَعْقَابِ مِنَ النَّارِ أَسْبِغُوا الْوُضُوءَ