(9) باب هَلْ يُدْخِلُ الْجُنُبُ يَدَهُ فِي الإِنَاءِ قَبْلَ أَنْ يَغْسِلَهَا إِذَا لَمْ يَكُنْ عَلَى يَدِهِ قَذَرٌ غَيْرُ الْجَنَابَةِ
Narrated `Aisha:
Whenever Allah's Messenger (ﷺ) took a bath of Janaba, he washed his hands first.
Reference: Sahih al-Bukhari 262
In-book reference: Book 5, Hadith 15
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 5, Hadith 262