Bulugh al-Maram #137
The Book of Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَأَصْلُهُ مُتَّفَقٌ عَلَيْه ِ 1 .1 - البخاري (4372)، ومسلم (1764) من حديث أبي هريرة أيضا، وفيه: "فانطلق -أي: ثمامة- إلى نخل قريب من المسجد، فاغتسل".
and its origin is in Al-Bukhari and Muslim.
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About Bulugh al-Maram
This hadith is #137 from Bulugh al-Maram, in the Book of The Book of Purification.