"In 1972, Prabhupada wrote to a female disciple: “You are married and your husband is striving to become a devotee of KRSNA, so you become his devotee, that is the position of husband and wife … the wife will take benefit and advance in spiritual life by serving her husband.”"
January 1, 1970
https://en.wikiquote.org/wiki/A._C._Bhaktivedanta_Swami_Prabhupada