The Prophet (peace and blessings be upon him) said:
"Go and take a ritual bath (ghusl) with water and lote-tree leaves, and shave off from your body the hair of (the time of) disbelief."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 858
Hadith Gradingالألبانی:حسن
Hadith Takhrij[طب] عن واثلة. صحيح أبي داود: ٣٨٣: طص، ك.