كتاب الطهارة
2
The Book of Purification
(12)
Chapter: The recommendation to increase the area washed for the forehead, arms, and legs well when performing wudu’
(12)
باب اسْتِحْبَابِ إِطَالَةِ الْغُرَّةِ وَالتَّحْجِيلِ فِي الْوُضُوءِ ‏‏

Nu'aim b. 'Abdullah al-Mujmir reported:

I saw Abu Huraira perform ablution. He washed his face and washed it well. He then washed his right hand including a portion of his arm. He then washed his left hand including a portion of his arm. He then wiped his head. He then washed his right foot including his shank, and then washed his left foot including shank, and then said: This is how I saw Allah's Messenger (ﷺ) perform his ablution. And (Abu Huraira) added that the Messenger of Allah (ﷺ) had observed: You shall have your faces hands and feet bright on the Day of Resurrection because of your perfect ablution. He who can afford among you, let him increase the brightness of his forehead and that of hands and legs.
حَدَّثَنِي أَبُو كُرَيْبٍ، مُحَمَّدُ بْنُ الْعَلاَءِ وَالْقَاسِمُ بْنُ زَكَرِيَّاءَ بْنِ دِينَارٍ وَعَبْدُ بْنُ حُمَيْدٍ قَالُوا حَدَّثَنَا خَالِدُ بْنُ مَخْلَدٍ، عَنْ سُلَيْمَانَ بْنِ بِلاَلٍ، حَدَّثَنِي عُمَارَةُ بْنُ غَزِيَّةَ الأَنْصَارِيُّ، عَنْ نُعَيْمِ بْنِ عَبْدِ اللَّهِ الْمُجْمِرِ، قَالَ رَأَيْتُ أَبَا هُرَيْرَةَ يَتَوَضَّأُ فَغَسَلَ وَجْهَهُ فَأَسْبَغَ الْوُضُوءَ ثُمَّ غَسَلَ يَدَهُ الْيُمْنَى حَتَّى أَشْرَعَ فِي الْعَضُدِ ثُمَّ يَدَهُ الْيُسْرَى حَتَّى أَشْرَعَ فِي الْعَضُدِ ثُمَّ مَسَحَ رَأْسَهُ ثُمَّ غَسَلَ رِجْلَهُ الْيُمْنَى حَتَّى أَشْرَعَ فِي السَّاقِ ثُمَّ غَسَلَ رِجْلَهُ الْيُسْرَى حَتَّى أَشْرَعَ فِي السَّاقِ ثُمَّ قَالَ هَكَذَا رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَتَوَضَّأُ ‏.‏ وَقَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ أَنْتُمُ الْغُرُّ الْمُحَجَّلُونَ يَوْمَ الْقِيَامَةِ مِنْ إِسْبَاغِ الْوُضُوءِ فَمَنِ اسْتَطَاعَ مِنْكُمْ فَلْيُطِلْ غُرَّتَهُ وَتَحْجِيلَهُ ‏"‏ ‏.‏
Reference : Sahih Muslim 246a
In-book reference : Book 2, Hadith 46
USC-MSA web (English) reference : Book 2, Hadith 477
  (deprecated numbering scheme)