Hadith 3:9
Abu Huraira reported God's messenger as saying, "My people will be summoned on the day of resurrection with white faces and hands and feet from the marks of ablution. If any of you can extend his brightness, let him do so." (Bukhari and Muslim.)
وَعَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صلى الله عَلَيْهِ وَسلم: «إِن أُمَّتِي يُدْعَوْنَ يَوْمَ الْقِيَامَةِ غُرًّا مُحَجَّلِينَ مِنْ آثَارِ الْوُضُوءِ فَمَنِ اسْتَطَاعَ مِنْكُمْ أَنْ يُطِيلَ غرته فَلْيفْعَل»
Original Reference: Mishkat al-Masabih 290