The Kitáb-i-Aqdas
167.Wash your feet   ¶152
The believers are exhorted in the Kitáb-i-Aqdas to bathe regularly, to wear clean clothes and generally to be the essence of cleanliness and refinement. The Synopsis and Codification, section IV.D.3.y.i.-vii., summarizes the relevant provisions. In relation to the washing of the feet, Bahá’u’lláh states that it is preferable to use warm water; however, washing in cold water is also permissible (Q&A 97).