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. 'Abdallah reported:

He saw Abu Huraira perform ablution. He washed his face and washed his hands up to the arms. He then washed his feet and reached up to the shanks and then said: I heard Allah's Messenger (ﷺ) say: My people would come with bright faces and bright hands and feet on account of the marks of ablution, so he who can increase the lustre of his forehead (and that of his hands and legs) should do so.
وَحَدَّثَنِي هَارُونُ بْنُ سَعِيدٍ الأَيْلِيُّ، حَدَّثَنِي ابْنُ وَهْبٍ، أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ، عَنْ سَعِيدِ بْنِ أَبِي هِلاَلٍ، عَنْ نُعَيْمِ بْنِ عَبْدِ اللَّهِ، أَنَّهُ رَأَى أَبَا هُرَيْرَةَ يَتَوَضَّأُ فَغَسَلَ وَجْهَهُ وَيَدَيْهِ حَتَّى كَادَ يَبْلُغُ الْمَنْكِبَيْنِ ثُمَّ غَسَلَ رِجْلَيْهِ حَتَّى رَفَعَ إِلَى السَّاقَيْنِ ثُمَّ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ إِنَّ أُمَّتِي يَأْتُونَ يَوْمَ الْقِيَامَةِ غُرًّا مُحَجَّلِينَ مِنْ أَثَرِ الْوُضُوءِ فَمَنِ اسْتَطَاعَ مِنْكُمْ أَنْ يُطِيلَ غُرَّتَهُ فَلْيَفْعَلْ ‏"‏ ‏.‏
Reference : Sahih Muslim 246b
In-book reference : Book 2, Hadith 47
USC-MSA web (English) reference : Book 2, Hadith 478
  (deprecated numbering scheme)