Ensuring water reaches the roots of the hair
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Etiquette of Purification (Wudu & Ghusl)
Ensuring water reaches the roots of the hair
The Prophet (SAW), when performing ghusl from major impurity, would rub his hands through his hair until satisfied that water had reached the scalp.
Reference: Sahih Muslim, on the authority of A'ishah (RA)
Explanation
This attention to detail ensures the ghusl achieves its full purpose of purification.