Purification (Kitab Al-Taharah)

Dawud :: Book 1 : Hadith 355

Narrated Qays ibn Asim:

I came to the Prophet (peace_be_upon_him) with the intention of embracing Islam. He commanded me to take a bath with water (boiled with) the leaves of the lote-tree.

Source materials are from the University of Southern California MSA site
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