The reference to Arafah concerns the Hajj occasion of standing at Arafah, when bathing is Sunnah as preparation for an important act of worship.
It should not be confused with a universal obligation to bathe on that calendar date.
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Ghusl on the Day of Arafah
Causes Requiring Ghusl and the Sunnah Baths
The reference to Arafah concerns the Hajj occasion of standing at Arafah, when bathing is Sunnah as preparation for an important act of worship.
It should not be confused with a universal obligation to bathe on that calendar date.