The Prophet (or 'Abul Qasim) said, "While a man was walking, clad in a two-piece garment and proud of himself with his hair well-combed, suddenly Allah made him sink into the earth and he will go on sinking into it till the Day of Resurrection.  

قَالَ النَّبِيُّ أَوْ قَالَ أَبُو الْقَاسِمِ ﷺ بَيْنَمَا رَجُلٌ يَمْشِي فِي حُلَّةٍ تُعْجِبُهُ نَفْسُهُ مُرَجِّلٌ جُمَّتَهُ إِذْ خَسَفَ اللَّهُ بِهِ فَهْوَ يَتَجَلَّلُ إِلَى يَوْمِ الْقِيَامَةِ