SB 6.18.47
sri-kasyapa uvaca
na himsyad bhuta-jatani
na sapen nanrtam vadet
na chindyan nakha-romani
na sprsed yad amangalam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Kasyapa Muni said: My dear wife, to follow this vow, do not be violent or cause harm to anyone. Do not curse anyone, and do not speak lies. Do not cut your nails and hair, and do not touch impure things like skulls and bones.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Kasyapa Muni’s first instruction to his wife was not to be envious. The general tendency of anyone within this material world is to be envious, and therefore, to become a Krsna conscious person, one must curb this tendency, as stated in Srimad-Bhagavatam (paramo nirmatsaranam). A Krsna conscious person is always nonenvious, whereas others are always envious. Thus Kasyapa Muni’s instruction that his wife not be envious indicates that this is the first stage of advancement in Krsna consciousness. Kasyapa Muni desired to train his wife to be a Krsna conscious person, for this would suffice to protect both her and Indra.