A man once asked ‘Alî – Allâh be pleased with him – about taking a full bath (ghusl). He replied,
“Wash every day if you want.” The man said, “No, what I mean is the ghusl.” ʿAli replied, “Al-Jumu’ah (Friday),
the Day of ‘Arafah, the Day of Al-Nahr
(sacrificial slaughter, ‘Eid al-Adhâ) and the Day of Al-Fitr (the ‘Eid following Ramadân).”
Al-Bayhaqî, Al-Sunan
Al-Kubrâ, hadîth #6343. In Irwâ Al-Ghalîl,
under hadîth
#146, Shaykh Al-Albânî graded its chain of transmission sahîh and said this is the best evidence for the recommendation to bath on the two
‘Eid celebrations.
~
Source: https://www.sayingsofthesalaf.net/when-to-bath/