Baha'i men not allowed to grow hair beyond the lobe of their ear ...not to shave their head.

"... not to allow the growth of men's hair beyond the lobe of the ear ... not to shave one's head."

"To wash one's feet; to cut one's nails; not to plunge one's hand in food (referring to the manner of eating)..."

(Synopsis and Codification of the Laws and Ordinances of the Kitab-i-Aqdas, pp. 48-51)

Should the garb of anyone be visibly sullied, his prayers shall not ascend to God, and the celestial Concourse will turn away from him.

(Bahá’u’lláh, Kitáb-i-Aqdas, p. 47)

"Cleanse every impure thing with a water which will not change by the three (colour, taste, smell); beware not to use a water which is infected by the air (stagnant) or by any other thing... "

(Baha'u'llah: Baha'i Proofs, p. 86)

Above quotes can be found in

(The Throne of the Inner Temple compiled by Elias Zohoori - Kingston, Jamaica: National Spiritual Assembly of The Bahá'ís of Jamaica, 1985)

https://bahai-library.com/zohoori_throne_inner_temple/