Language:
كتاب الغسل
5  
Bathing (Ghusl)
(9)
Chapter: Can a Junub (a person who has yet to take bath after the sexual act or wet dream) put his hands in a pot (containing water) before washing them if they are not polluted with a dirty thing except Janaba?
(9)
باب هَلْ يُدْخِلُ الْجُنُبُ يَدَهُ فِي الإِنَاءِ قَبْلَ أَنْ يَغْسِلَهَا إِذَا لَمْ يَكُنْ عَلَى يَدِهِ قَذَرٌ غَيْرُ الْجَنَابَةِ
Sahih al-Bukhari 264

Narrated Anas bin Malik:

The Prophet (ﷺ) and one of his wives used to take a bath from a single pot of water. (Shu`ba added to Anas' Statement "After the Janaba").

حَدَّثَنَا أَبُو الْوَلِيدِ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ عَبْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ جَبْرٍ، قَالَ سَمِعْتُ أَنَسَ بْنَ مَالِكٍ، يَقُولُ كَانَ النَّبِيُّ صلى الله عليه وسلم وَالْمَرْأَةُ مِنْ نِسَائِهِ يَغْتَسِلاَنِ مِنْ إِنَاءٍ وَاحِدٍ‏.‏ زَادَ مُسْلِمٌ وَوَهْبٌ عَنْ شُعْبَةَ مِنَ الْجَنَابَةِ‏.‏
Reference : Sahih al-Bukhari 264
In-book reference : Book 5, Hadith 17
USC-MSA web (English) reference : Vol. 1, Book 5, Hadith 264
  (deprecated numbering scheme)