Sahih al-Bukhari 262
Sahih al-Bukhari · Book 5: Bathing (Ghusl) · 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?
Narrated `Aisha:
حَدَّثَنَا مُسَدَّدٌ ، قَالَ حَدَّثَنَا حَمَّادٌ ، عَنْ هِشَامٍ ، عَنْ أَبِيهِ ، عَنْ عَائِشَةَ ، قَالَتْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا اغْتَسَلَ مِنَ الْجَنَابَةِ غَسَلَ يَدَهُ.
Whenever Allah's Messenger (ﷺ) took a bath of Janaba, he washed his hands first.